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Encyclopedia results for Cycle (graph theory)

Cycle (graph theory)





Encyclopedia results for Cycle (graph theory)

  1. Cycle decomposition (graph theory)

    For the notation used to express permutation s Cycle decomposition group theory In graph theory , a cycle decomposition is a partition of a set partitioning of the vertices of a graph into subsets, such that the vertices in each subset lie on a Cycle graph theory cycle . Definition Empty section date May 2010 References citation last1 Bondy first1 J.A. last2 Murty first2 U.S.R. title Graph Theory publisher Springer year 2008 isbn 978 1 84628 969 9 chapter 2.4 Decompositions and coverings . DEFAULTSORT Cycle Decomposition Category Graph theory combin stub ...   more details



  1. Cycle (graph theory)

    citations missing date January 2008 In graph theory , the term cycle may refer to a closed path graph theory path . If repeated vertex graph theory vertices are allowed, it is more often called a closed walk . If the path is a simple path, with no repeated vertices or edges other than the starting and ending vertices, it may also be called a simple cycle , circuit , circle , or polygon see Cycle graph . A cycle in a directed graph is called a directed cycle. The term cycle may also refer to An element of the binary or integral or real, complex, etc. cycle space of a graph. This is the usage closest to that in the rest of mathematics, in particular algebraic topology . Such a cycle may be called a binary cycle , integral cycle , etc. An edge set that has even degree at every vertex also called an even edge set or, when taken together with its vertices, an even subgraph . This is equivalent to a binary cycle, since a binary cycle is the indicator function of an edge set of this type. Chordless cycle s in a graph are sometimes called graph holes . A graph antihole is the complement graph complement of a graph hole. Cycle detection A graph has a cycle if and only if depth first search produces a back edge. ref cite book last Tucker first Alan title Applied Combinatorics year 2006 publisher John Wiley & sons location Hoboken isbn 978 0 471 73507 8 edition 5th ed. page 49 chapter Chapter 2 Covering Circuits and Graph Colorings ref This is true for both directed and undirected graphs. In the case of undirected graphs, only O n time is required, since at most n 1 edges can be tree edges where n is the number of vertices . In the case of directed graphs, topological sorting algorithms will usually detect cycles too, since those are obstacles for topological order to exist. See also Euler cycle Hamiltonian cycle Chordal graph References reflist Category Graph theory objects de Zyklus Graphentheorie fr Cycle th orie des graphes hu K r gr felm let ja pl Cykl teoria graf w pt ...   more details



  1. Cycle graph

    Otheruses4 connected, 2 regular graphs infobox graph name Cycle graph image Image Undirected 6 cycle.svg 160px image caption A cycle graph of length 6 vertices n edges n automorphisms 2 n D sub n sub chromatic ... n spectrum 2 cos 2 k n sup 1 sup k 1,..., n notation math C n math properties Regular graph 2 regular br Vertex transitive graph Vertex transitive br Edge transitive graph Edge transitive br Unit distance graph Unit distance br Hamiltonian graph Hamiltonian br Eulerian graph Eulerian In graph theory , a cycle graph or circular graph is a graph mathematics graph that consists of a single Cycle graph theory cycle , or in other words, some number of vertices connected in a closed chain. The cycle graph with n vertices is called C sub n sub . The number of vertices in C sub n sub equals the number of Edge graph theory edge s, and every vertex has degree graph theory degree   2 that is, every vertex has exactly two edges incident with it. Terminology There are many synonym s for cycle graph . These include simple cycle graph and cyclic graph , although the latter term is less often used, because it can also refer to graphs which are merely not directed acyclic graph acyclic . Among graph theorists, cycle , polygon , or n gon are also often used. A cycle with an even number of vertices ... A cycle graph is Connected graph Connected regular graph 2 regular Eulerian graph Eulerian Hamiltonian ... colorable and 3 edge colorable, for any number of vertices A unit distance graph In addition As cycle ... other edge, so the n cycle is a symmetric graph . Directed cycle graph Image DC8.png frame right A directed cycle graph of length 8 A directed cycle graph is a directed version of a cycle graph, with all ... . A directed cycle graph has uniform in degree  1 and uniform out degree  1. Directed cycle graphs are Cayley graph s for cyclic group s see e.g. Trevisan . See also commonscat Cycle graphs ... title Cycle Graph discussion of both 2 regular cycle graphs and the group theoretic concept of cycle ...   more details



  1. Cycle graph (algebra)

    otheruses2 Cycle graph In group theory , a sub field of abstract algebra , a group cycle graph illustrates ... the structure of small finite group s. For groups with fewer than 16 elements, the cycle graph ..., the number of distinct elements in it. In a cycle graph, the cycle is represented as a series of polygons ... have no element in common but the identity. The cycle graph displays each interesting cycle as a polygon ... , a . Take one vertex graph theory point for each element of the original group. For each primitive ... . The result is the cycle graph. Technically, the above description implies that if a e , so a has ... to only use one. Properties As an example of a group cycle graph, consider the dihedral group Dih sub 4 sub . The multiplication table for this group is shown on the left, and the cycle graph is shown on the right with e specifying the identity element. File Dih4 cycle graph.svg thumb Cycle graph ... direction. Image GroupDiagramQ8.png frame right Cycle graph of the quaternion group Q sub 8 ... group , whose cycle graph is shown on the right. Each of the elements in the middle row when ... by symmetry in these graphs. Image GroupDiagramC2C8.png frame left Cycle graph of the order 16 group Z sub 2 sub x Z sub 8 sub . Image GroupDiagramMOD16.png frame right Cycle graph of the order 16 ... be identified in the cycle graph. It is the element whose distance is the same from the opposite ... contains, for any group of order n, a subgroup isomorphic to that group. Thus the cycle graph of every group of order n will be found as a subgraph of the cycle graph of S sub n sub . See example v ... thumb 300px Cycle graph of the symmetric group S sub 4 sub       valign top File Dihedral group of order 8 cycle graph subgroup of S4 elements 1,6... .svg thumb 300px One of three Dih sub 4 sub subgraphs found in the S sub 4 sub cycle graph br br It s the same graph like File GroupDiagramMiniD8.png See also commonscat Group cycle graphs List of small groups Cayley graph External links ...   more details



  1. Austrian business cycle theory

    Austrian School sidebar expanded Theory The Austrian business cycle theory or ABCT attempts to explain ... December 2007. ref The main proponents of the Austrian business cycle theory historically were Austrian ... theory of the business cycle is now rarely discussed by mainstream economists, but was more ... the Austrian business cycle theory . Review of Austrian Economics . ref More recently, mainstream ... 04 ref According to the theory, the business cycle unfolds in the following way Low interest rates tend ... . This early development of Austrian business cycle theory was a direct manifestation of Mises s rejection ... Bawerk s Capital and Interest , the Austrian theory of the business cycle remains sufficiently distinct ... The Austrian Theory of the Trade Cycle Compiled by Richard M. Ebeling, referenced 2009 05 ... Rothbard, the Austrian business cycle theory attempts to answer the following questions about things ... ref Policy implications Many proponents of the Austrian School business cycle theory such as Murray ... Glass Steagall , Frank Shostak ref The main proponents of the Austrian business cycle theory ... to Nicholas Kaldor , Hayek s work on the Austrian business cycle theory had at first fascinated the academic ... theory of the business cycle in The Great Depression 1934 , later regretted having written that book ... of interest in the Austrian business cycle theory, but has also resulted in a revival of interest ... The Austrian theory is considered one of the precursors to the modern credit cycle theory, which is emphasized ... credit boom theory as a cycle in which loans increase as the economy expands, particularly where regulation ... Criticisms According to most mainstream economists, the Austrian business cycle theory is incorrect ... cycle theory title John Quiggin Austrian Business Cycle Theory work johnquiggin.com accessdate 19 July 2010 ref Most mainstream economists argue that the Austrian business cycle theory requires ... Cycle Theory ref In response, Austrian economists Anthony Carilli and Gregory Dempster have ...   more details



  1. Product life-cycle theory

    Orphan date February 2009 The product life cycle theory is an economic theory that was developed by Raymond Vernon in response to the failure of the Heckscher Ohlin model to explain the observed pattern of international trade . The theory suggests that early in a product s life cycle all the parts and labor associated with that product come from the area in which it was invented. After the product becomes adopted and used in the world markets, production gradually moves away from the point of origin. In some situations, the product becomes an item that is imported by its original country of invention. ref cite book last Hill first Charles authorlink Charles Hill title International Business Competing in the Global Marketplace 6th ed. publisher McGraw Hill year 2007 pages 168 doi isbn 978 0 07 310255 9 ref A commonly used example of this is the invention, growth and production of the personal computer with respect to the United States . The model applies to labor saving and capital using products that at least at first cater to high income groups. In the new product stage, the product is produced and consumed in the US no export trade occurs. In the maturing product stage, mass production techniques are developed and foreign demand in developed countries expands the US now exports the product to other developed countries. In the standardized product stage, production moves to developing countries, which then export the product to developed countries. The model demonstrates dynamic comparative advantage . The country that has the comparative advantage in the production of the product changes from the innovating developed country to the developing countries. Product life cycle There are five stages in a product s life cycle Introduction Growth Maturity Saturation Decline The location of production depends on the stage of the cycle. Stage 1 Introduction New products are introduced to meet local i.e., national needs, and new products are first exported to similar countries ...   more details



  1. Social cycle theory

    sociology Social cycle theories are among the earliest social theories in sociology . Unlike the theory ... new, unique direction s , sociological cycle theory argues that events and stages of society and history are generally repeating themselves in cycles. Such a theory does not necessarily imply that there cannot be any social progress . In the early theory of Sima Qian and the more recent theories ... uc item 9c96x0p1 Chapter 4 . ref as well as in the Law of Social Cycle Varnic theory .... The Saeculum was identified in Roman times. In recent times, P. R. Sarkar in his Social cycle theory Sarkar Social Cycle Theory has used this idea to elaborate his interpretation of history. Classical ... was about to collapse. The first social cycle theory in sociology was created by Italy Italian ... to the lions and vice versa. Sociological cycle theory was also developed by Pitirim A. Sorokin ... Theory Its Origins, History, and Contemporary Relevance By Daniel W. Rossides. http books.google.com ..., Greek, Roman, German, and Slav, among others . He wrote that each civilization has a life cycle ... civilization was approaching its Golden Age . A similar theory was put forward by Oswald Spengler 1880 ... . He centered his theory on the concept of an elite social class , which he divided into cunning ... cycle s Usher 1989 . At the moment we have a very considerable number of such models Chu and Lee ... growth resumed and a new sociodemographic cycle started. It has become possible to model ... different fields have introduced cycle theories to predict civilizational collapses in approaches that apply ... of Joseph Tainter suggesting a civilizational life cycle. In more micro studies that follow the work ... and economic productivity. In Sarkar s Law of Social Cycle social progress is defined in terms of a new vision of Progressive utilization theory human progress by placing an emphasis on hindu idealism human spiritual development . Integrated with that is Sarkar s theory of four basic ages of warriors ...   more details



  1. Real business cycle theory

    tone date July 2008 Economics sidebar Real business cycle theory RBC theory are a class of macroeconomic models in which business cycle fluctuations to a large extent can be accounted for by real in contrast to nominal Shock economics shocks . Unlike other leading theories of the business cycle, RBC theory sees recessions and periods of economic growth as the economic efficiency efficient response ... changes the decisions of all actors in an economy? Real business cycle theory Economists have come ... literature on real business cycle theory was introduced by Finn E. Kydland and Edward C. Prescott in their seminal ... a coefficient of 80 really is. Criticisms Real business cycle theory is a major point of contention ... reject RBC theory in turn My view is that real business cycle models of the type urged on us by Ed ... Depression , among other crises. See also Austrian business cycle theory Business cycle Welfare cost ... Cycle Theory journal Federal Reserve Bank of Minneapolis Quarterly Review volume 10 number 4 issue ... footer Category Macroeconomics Category Business cycle theory Category New classical macroeconomics ... theory, business cycles are therefore Real versus nominal value economics real in that they do not represent ... operation of the economy, given the structure of the economy. RBC theory differs in this way from other theories of the business cycle such as Keynesian economics and Monetarism that see recessions as the failure of some market to clear. RBC theory is associated with freshwater economics the Chicago ..., correlations close to zero, implies no systematic relationship to the business cycle. We find that productivity ... volatile than consumption. The life cycle hypothesis argues that households base their consumption ... this is how the basic RBC model qualitatively explains key business cycle regularities. Yet ... this. The reason why this theory is so celebrated today is that using this methodology, the model closely mimics many business cycle properties. Yet current RBC models have not fully explained all ...   more details



  1. Reproductive-cell cycle theory

    cell cycle theory of aging an update. journal Experimental Gerontology volume 46 issue 2 pages 100 ... studies in support of the theory have shown that suppressing the HPG axis, such as when organisms ...   more details



  1. Graph theory

    , graph theory is the study of graph mathematics graphs , mathematical structures used to model pairwise ... of vertex graph theory vertices or nodes and a collection of edges that connect pairs of vertices .... The graphs studied in graph theory should not be confused with graph of a function graphs of functions ... . Refer to glossary of graph theory for basic definitions in graph theory. Applications Graphs ... Optimality Theory , which uses lattice graph s and morphology e.g. finite state morphology, using ... , as well as various Net projects, such as WordNet , VerbNet , and others. Graph theory is also ..., as well as the dynamics of a physical process on such systems. Graph theory is also widely used ..., graph theory is useful in biology and conservation efforts where a vertex can represent regions where ... are useful in geometry and certain parts of topology, e.g. Knot Theory. Algebraic graph theory has close links with group theory. A graph structure can be extended by assigning a weight to each edge of the graph ... of graph theory is called a network mathematics network . Network theory Network analysis ... of a network, such as the distribution of vertex degrees and the Distance graph theory diameter ... the network, for example, for a Transportation network graph theory transportation network , the level ... properties of networks. History The first text book on graph theory was written by Denes Konig ... in 1736 is regarded as the first paper in the history of graph theory. ref name Biggs Citation author Biggs, N. Lloyd, E. and Wilson, R. title Graph Theory, 1736 1936 publisher Oxford University Press ... graph theory trees . This study had many implications in theoretical chemistry . The involved ... chemistry is at the origin of a part of the standard terminology of graph theory. In particular, the term ... . One of the most famous and productive problems of graph theory is the four color ... was at the origin of another branch of graph theory, extremal graph theory . The four color problem ...   more details



  1. Periodic graph (graph theory)

    Other uses Periodic graph disambiguation Periodic graph In graph theory , a branch of mathematics, a periodic graph with respect to an operator F on graphs is one for which there exists an integer n     0 such that F sup n sup G is graph isomorphism isomorphic to G . ref Citation last Zelinka first B. title Periodicity of graph operators journal Discrete Mathematics volume 235 pages 349 351 year 2001 url http www.sciencedirect.com science? ob ArticleURL& udi B6V00 433PBV1 16& user 10& coverDate 05 2F28 2F2001& rdoc 34& fmt high& orig browse& srch doc info 23toc 235632 232001 23997649998 23251347 23FLT 23display 23Volume & cdi 5632& sort d& docanchor & ct 39& acct C000050221& version 1& urlVersion 0& userid 10&md5 c91abbf2a679877d22212fa49932088c accessdate 14 August 2010 ref For example, every graph is periodic with respect to the complement graph complementation operator , whereas only complete graph s are periodic with respect to the operator that assigns to each graph the complete graph on the same vertices. Periodicity is one of many properties of graph operators, the central topic in graph dynamics . ref Cite book last Prisner first Erich title Graph Dynamics publisher CRC Press year 1995 isbn 9780582286962 ref References Reflist DEFAULTSORT Periodic Graph Graph Theory Category Graph invariants Category Graph operations combin stub ...   more details



  1. Cycle

    wiktionarypar cycle cyclic cyclical tocright Cycle , and in some cases cyclic , may refer to A process that returns to its beginning and repeats itself in the same sequence. Such processes are seen in many fields, such as physics, mathematics, biology, astronomy, economics, audio frequency, etc. Bicycle or Motorcycle See also List of cycles Chemistry Cyclic compound Economics Business cycle , economy wide fluctuations in production or economic activity over several months or years Mathematics Algebraic cycle and Hodge cycle , homology classes in algebraic geometry Cycle algebraic topology , a simplicial chain with zero boundary Cycle graph theory , a nontrivial path in a graph from a node to itself Cycle mathematics , a basic permutation all permutations are products of cycles Cyclic mathematics shows other terms in mathematics beginning with cyclic or cycle Turn geometry or cycle, a unit of plane angle equal to 360 degrees Music Cycle music , a section of a piece that is repeated or repeatable Cyclic form , a technique of construction involving multiple sections or movements Cycles Cartel album Cycles Cartel album Cycles David Darling album Cycles David Darling album Cycles Doobie ... cycle , a collection of pitch classes generated from a sequence the same interval class Miscellaneous Battery cycle , charging and discharging a rechargeable battery Cyclic flower , in botany, one way in which flower parts may be arranged Cycle baseball , a single, double, triple, and home run in any order by the same player in one game Cycle film Cycle film , a 2008 Malayalam film Cycles render ... control for helicopters Instruction cycle , the time period during which a computer processes a machine language instruction Social cycle various cycles in social sciences See also lookfrom intitle ... es Ciclo desambiguaci n eo Ciklo fr Cycle io Ciklo hu Ciklus egy rtelm s t lap ja no Kretsl p pl Cykl ru simple Cycle sk Cyklus sv Cykel olika betydelser uk ...   more details



  1. The Cycle

    For the baseball term Hitting for the cycle Unreferenced date September 2011 Expand Persian fa yes date December 2009 Infobox film name image alt caption director Dariush Mehrjui producer writer Dariush Mehrjui story Gholam Hossein Saedi based on The play Aashghaal duni by Gholam Hossein Saedi starring Saeed Kangarani br Ezzatollah Entezami br Ali Nassirian br Esmail Mohammadi br Fourouzan br Bahman Fersi music Hormoz Farhat cinematography Houshang Baharlou editing Talat Mirfendereski studio distributor released 1975 1978 in Iran runtime 101 minutes country Iran language Persian budget gross Over 16 million Iranian rial rials The Cycle , Dayereh ye Mina is a 1975 Iran Iranian film directed by Dariush Mehrjui . It was Iran s List of submissions to the 50th Academy Awards for Best Foreign Language Film submission for Best Foreign Language Film at the 50th Academy Awards , the first year that Iran participated in the award. The film was banned for three years before being given permission to release, and was finally released in Iran on April 12, 1978. The movie s plot centered on the illegal trade in blood donations against the backdrop poverty and life in shanty towns . http tehranavenue.com article.php?id 807 A young man, Ali Saeed Kangarani , takes his sick father Esmail Mohammadi to a hospital in Tehran. When his father is unable to be admitted, they wait outside the hospital and meet Sameri Ezzatollah Entezami . Dr. Sameri offers them enough money for Ali s father s treatment if they assist him with some work. They meet him the next morning at a crossroads and get in a truck with some other people, unaware of what they will be doing or where they will be going. They arrive at a laboratory, where Ali s father is asked to give blood. He refuses, but Ali agrees to have his blood taken, and for that he is given 20 Iranian toman tomans . Sameri deals .... External links imdb title 0077403 Dariush Mehrjui DEFAULTSORT Cycle Category 1975 films Category ...   more details



  1. List of graph theory topics

    This is a list of graph theory topics , by Wikipedia page. See glossary of graph theory for basic terminology Examples and types of graphs See also Trees Trees Bipartite graph Complete bipartite graph Disperser Expander graph Expander Extractor mathematics Extractor Bivariegated graph Cayley graph Circle graph Complement graph Complete graph Cubic graph De Bruijn graph Dense graph Dipole graph Directed graph Directed acyclic graph Interval graph Line graph Minor graph theory Minor graph Robertson Seymour theorem Petersen graph Planar graph Dual polyhedron Outerplanar graph Random graph Regular graph Scale free network Sparse graph Sparse graph code String graph Total graph Trellis graph Tur n graph Edge transitive graph Vertex transitive graph Visibility graph Museum guard problem Wheel graph Graph coloring Acyclic coloring Chromatic polynomial Cocoloring Complete coloring Edge coloring Exact coloring Four color theorem Fractional coloring Graph two coloring Harmonious coloring List coloring ... Tait s conjecture Total coloring Uniquely colorable graph Paths and cycles Path graph theory Seven Bridges ... salesman problem Path analysis Trees This section is linked from Tree graph theory Tree graph theory ... tree Quadtree Terminology Node graph theory Node Child node Parent node Leaf node Root node Root graph ... in the graph theory sense, because there may not be a unique path between two vertices Tree descriptive set theory Euler tour technique Graphs in logic Conceptual graph Entitative graph Existential ... Clique graph theory Cliques and Independent set graph theory independent set s Clique problem Connected component graph theory Connected component Cycle space de Bruijn sequences degree diameter Degree diameter problem Entanglement graph measure Erd s Gy rf s conjecture Extremal graph theory Critical ... Shannon switching game Snark graph theory Spectral graph theory Spring based algorithm Strongly ... Graph theory Category Graph theory Category Outlines ...   more details



  1. Rank (graph theory)

    In graph theory , a branch of mathematics, the rank of an undirected graph is defined as the number math n &minus c , where math n is the number of vertex graph theory vertices and math c is the number of Connected component graph theory connected components of the graph. Equivalently, the rank of a graph is the rank linear algebra rank of the oriented incidence matrix associated with the graph. Analogously, the nullity of an undirected graph is the Kernel matrix nullity of its incidence matrix, given by the formula math m &minus n c , where n and c are as above and m is the number of edges in the graph. The nullity is equal to the first Betti number of the graph. The sum of the rank and the nullity is the number of edges. See also Circuit rank Cycle rank References citation last Chen first Wai Kai title Applied Graph Theory publisher North Holland Publishing Company year 1976 isbn 0720423716 . Category Algebraic graph theory Category Graph connectivity Category Graph invariants ...   more details



  1. Loop (graph theory)

    See also Cycle graph theory List of cycles Loops in Topology M bius ladder M bius strip Strange loop Klein bottle Category Graph theory objects ca Bucle teoria de grafs es Bucle teor a de grafos fr ...Image 6n graph2.svg thumb A graph with a loop on vertex 1 In graph theory , a loop also called a self loop or a buckle is an edge graph theory edge that connects a vertex graph theory vertex to itself. A Graph mathematics Simple graph simple graph contains no loops. Depending on the context, a graph mathematics graph or a multigraph may be defined so as to either allow or disallow the presence of loops often in concert with allowing or disallowing multiple edges between the same vertices Where graphs are defined so as to allow loops and multiple edges, a graph without loops or multiple edges is often distinguished from other graphs by calling it a simple graph . Where graphs are defined so as to disallow loops and multiple edges, a graph that does have loops or multiple edges is often distinguished from the graphs that satisfy these constraints by calling it a multigraph . Degree For an undirected graph , the degree graph theory degree of a vertex is equal to the number of adjacent vertex adjacent vertices . A special case is a loop, which adds two to the degree. This can be understood ..., to the degree. For a directed graph , a loop adds one to the in degree graph theory in degree and one to the out degree graph theory out degree Notes div class references small references div References Balakrishnan, V. K. Graph Theory , McGraw Hill 1 edition February 1, 1997 . ISBN 0 07 005489 4. Bollob s, B la Modern Graph Theory , Springer 1st edition August 12, 2002 . ISBN 0 387 98488 7. Diestel, Reinhard Graph Theory , Springer 2nd edition February 18, 2000 . ISBN 0 387 98976 5. Gross, Jonathon L, and Yellen, Jay Graph Theory and Its Applications , CRC Press December 30, 1998 . ISBN 0 8493 3982 0. Gross, Jonathon L, and Yellen, Jay eds Handbook of Graph Theory . CRC December 29, 2003 ...   more details



  1. Core (graph theory)

    about graph homomorphisms the subgraph in which all vertices have high degree k core In the mathematics mathematical field of graph theory , a core is a notion that describes behavior of a graph mathematics graph with respect to graph homomorphism s. Definition Graph math G math is a core if every homomorphism math f G to G math is an graph isomorphism isomorphism , that is it is a bijection of vertices of math G math . A core of a graph math H math is a graph math G math such that There exists a homomorphism from math H math to math G math , there exists a homomorphism from math G math to math H math , and math G math is minimal with this property. Examples Any complete graph is a core. A cycle graph theory cycle of odd length is a core. A core of a cycle of even length is math K 2 math . Properties Core of a graph is determined uniquely, up to graph isomorphism isomorphism . If math G to H math and math H to G math then the graphs math G math and math H math have isomorphic cores. See also the degeneracy graph theory k core of a graph, obtained by iteratively removing all vertices of degree at most k , is a different notion. References Chris Godsil Godsil, Chris , and Gordon Royle Royle, Gordon . Algebraic Graph Theory. Graduate Texts in Mathematics, Vol. 207. Springer Verlag, New York, 2001. Chapter 6 section 2. Category Graph theory objects ...   more details



  1. Girth (graph theory)

    In graph theory , the girth of a graph is the length of a shortest cycle graph cycle contained in the graph. ref R. Diestel, Graph Theory , p.8. 3rd Edition, Springer Verlag, 2005 ref If the graph does not contain any cycles i.e. it s an acyclic graph , its girth is defined to be infinity . ref citation url http mathworld.wolfram.com Girth.html title Girth Wolfram MathWorld ref For example, a 4 cycle square has girth 4. A grid has girth 4 as well, and a triangular mesh has girth 3. A graph with girth four or more is triangle free graph triangle free . Cages A cubic graph all vertices have degree three of girth math g that is as small as possible is known as a math g cage graph theory cage or as a 3, math g cage . The Petersen graph is the unique 5 cage it is the smallest cubic graph of girth 5 , the Heawood graph is the unique 6 cage, the McGee graph is the unique 7 cage and the Tutte eight ... pages 34 38 title Graph theory and probability volume 11 year 1959 doi 10.4153 CJM 1959 003 9 . ref ... no Independent set graph theory independent set of size math n 2 k . Therefore, removing one vertex from each short cycle leaves a smaller graph with girth greater than math g , in which each color .... Related concepts The odd girth and even girth of a graph are the lengths of a shortest odd cycle ... 10 cage , the Harries graph and the Harries Wong graph . gallery Image Petersen1 tiny.svg The Petersen graph has a girth of 5 Image Heawood Graph.svg The Heawood graph has a girth of 6 Image McGee graph.svg The McGee graph has a girth of 7 Image Tutte eight cage.svg The Tutte Coxeter graph Tutte eight cage has a girth of 8 gallery Girth and graph coloring For any positive integers math g and math , there exists a graph with girth at least math g and chromatic number at least math for instance, the Gr tzsch graph is triangle free and has chromatic number 4, and repeating the Mycielskian construction used to form the Gr tzsch graph produces triangle free graphs of arbitrarily large chromatic ...   more details



  1. Path (graph theory)

    vertices in the path are internal vertices . A cycle graph theory cycle is a path such that the start vertex and end vertex are the same. The choice of the start vertex in a cycle is arbitrary. Image Directed cycle.svg frame A directed cycle. Without the arrows, it is just a cycle. This is not a simple cycle, since the blue vertices are used twice. Paths and cycles are fundamental concepts of graph theory, described in the introductory sections of most graph theory texts. See e.g. Bondy ... . In modern graph theory , most often simple is implied i.e., cycle means simple cycle and path means simple path , but this convention is not always observed, especially in applied graph theory. Some ...In graph theory , a path in a graph mathematics graph is a sequence of vertex graph theory vertices such that from each of its vertices there is an edge graph theory edge to the next vertex in the sequence ... topics concerning paths in graphs. The vertices of a path are said to be connected graph theory connected . The vertices of a directed cycle are said to be strongly connected . Different types of path The same concepts apply both to undirected graph s and directed graph s, with the edges being directed from each vertex to the following one. Often the terms directed path and directed cycle are used in the directed case. A path with no repeated vertices is called a simple path , and a cycle with no repeated ... every vertex, without repetition, of the graph is known as a Hamiltonian cycle . A cycle with just ... instead of weight. See also Glossary of graph theory Shortest path problem Traveling salesman problem .... title Graph Theory with Applications year 1976 publisher North Holland isbn 0 444 19451 7 pages ... title Graph Theory edition 3rd ed. url http www.math.uni hamburg.de home diestel books graph.theory ... 6 pages 6 9 cite book author Gibbons, A. title Algorithmic Graph Theory year 1985 publisher Cambridge ... Graph theory objects Category Graph connectivity cs Cesta graf de Weg Graphentheorie es Camino teor a ...   more details



  1. Neighbourhood (graph theory)

    disambiguation . In graph theory , an adjacent vertex of a vertex graph theory vertex v in a Graph mathematics graph is a vertex that is connected to v by an edge graph theory edge . The neighbourhood of a vertex v in a graph G is the induced subgraph Subgraphs induced subgraph of G consisting .... The degree graph theory degree of a vertex is equal to the number of adjacent vertices. A special case is a loop graph theory loop that connects a vertex to itself if such an edge exists, the vertex ... octahedron graph , the neighbourhood of any vertex is a 4 Cycle graph cycle . If all vertices in G have neighbourhoods that are Graph isomorphism isomorphic to the same graph H , G is said to be locally H , and if all vertices in G have neighbourhoods that belong to some graph family F , G ... octahedron graph shown in the figure, each vertex has a neighbourhood isomorphic to a Cycle graph cycle of four vertices, so the octahedron is locally  C sub 4 sub . For example Any complete graph ... Independent set graph theory independent . Every k Chromatic number chromatic graph is locally ... cyclic if every neighbourhood is a Cycle graph cycle . For instance, the octahedron is the unique locally ... title Graph Theory, Lag w volume 1018 year 1983 chapter On local properties of finite graphs ... guarantee for approximate graph coloring volume 30 year 1983 . Category Graph theory objects de ...Image 6n graf.svg thumb A graph consisting of 6 vertices and 7 edges For other meanings of neighbourhoods ... shows a graph of 6 vertices and 7 edges. Vertex 5 is adjacent to vertices 1, 2, and 4 but it is not adjacent to 3 and  6. The neighbourhood of vertex 5 is the graph with three vertices, 1, 2, and  ... v or when the graph is unambiguous   N v . The same neighbourhood notation may also be used to refer ... of a graph, which is a measure of the average Dense graph density of its neighbourhoods. In addition ... of complete graphs. A Tur n graph T rs , r is locally T r 1 s , r 1 . More generally any Tur n graph ...   more details



  1. Spectral graph theory

    star graph theory star and the graph union of the 4 vertex cycle graph theory cycle and the single vertex graph, as reported by Collatz and Sinogowitz ref Collatz, L. and Sinogowitz, U. Spektren ...In mathematics , spectral graph theory is the study of properties of a graph mathematics graph in relationship ... Almost all tree graph theory tree s are cospectral, i.e., the share of cospectral trees on n vertices .... ref History outline Spectral graph theory emerged in the 1950s and 1960s. Besides graph theory graph ... Results in the Theory of Graph Spectra . ref Drago M. Cvetkovi , Michael Doob, Horst Sachs, A. Torgasev, Recent Results in the Theory of Graph Spectra Annals of Disrete mathematics series, North ... Spectral Graph Theory and its Applications web page of the course of Daniel Spielman at Yale University http cs www.cs.yale.edu homes spielman sgta Spectral Graph Theory and its Applications, A tutorial ... 778S Web page of a course on spectral graph theory at USC. Lecture notes are made available online. http www.math.ucsd.edu fan research revised.html Fan Chung s revised book on Spectral Graph theory first 4 chapters are available http www.sgt.pep.ufrj.br index.php Spectral Graph Theory page at COPPE Federal University of Rio de Janeiro DEFAULTSORT Spectral Graph Theory Category Algebraic graph ... to the graph, such as its adjacency matrix or Laplacian matrix . An undirected graph has a symmetric ... the graph s Eigendecomposition of a matrix spectrum and a complete set of orthonormal eigenvectors. While the adjacency matrix depends on the vertex labeling, its spectrum is a graph invariant . Spectral graph theory is also concerned with graph parameters that are defined via multiplicites of eigenvalues of matrices associated to the graph, such as the Colin de Verdi re graph invariant Colin de ... matrices of the graphs have equal multisets of eigenvalues. Isospectral graphs need not be Graph ... Cospectral Graphs ref in 1957. The smallest pair of nonisomorphic cospectral polyhedral graph ...   more details



  1. Glossary of graph theory

    has no repeated vertices or edges, is called a Cycle graph theory cycle . Like path , this term traditionally ..., it is a Hamiltonian cycle . See also Graph mathematics List of graph theory topics References references ...wiktionary Appendix Glossary of graph theory Graph theory is a growing area in mathematical research .... Basics A Graph mathematics graph G consists of two types of elements, namely vertex graph theory vertices and Edge graph theory edges . Every edge has two endpoints in the set of vertices, and is said ..., i.e. E G . ref cite book last Harris first John M. title Combinatorics and Graph Theory year 2000 ... new 26 forthcoming titles 28default 29 book 978 0 387 79710 6 ref A Loop graph theory loop is an edge ... to H . A subgraph H is a spanning subgraph , or Factor graph theory factor , of a graph G if it has ..., a Path graph theory path referred to what is now usually known as an open walk . Nowadays ... graph, 1, 5, 2, 1 is a cycle of length 3. A cycle, unlike a path, is not allowed to have ... edges in a directed graph , and C sub 3 sub is called a triangle . A cycle that has odd length is an odd cycle otherwise it is an even cycle . One theorem is that a graph is bipartite graph bipartite ... if it contains no cycles unicyclic if it contains exactly one cycle and pancyclic graph pancyclic if it contains cycles of every possible length from 3 to the order of the graph . The Girth graph theory girth of a graph is the length of a shortest simple cycle in the graph and the Circumference graph theory circumference , the length of a longest simple cycle. The girth and circumference of an acyclic graph are defined to be infinity . A path or cycle is Hamiltonian path Hamiltonian or spanning ... graph . A graph that contains a Hamiltonian cycle is a Hamiltonian graph . A trail or circuit or cycle ... tree with 6 vertices and 5 edges. A tree graph theory tree is a connected acyclic simple graph. For directed ... graph theory star is K sub 1, k sub . An induced star with 3 edges is a claw . A caterpillar tree caterpillar ...   more details



  1. Cage (graph theory)

    graph and the Harries Wong graph . But there is only one 3,11 cage the Balaban 11 cage with 112 vertices . Known cages A degree one graph has no cycle, and a connected degree two graph has girth ... 12 40 62 312 7812 r 7 8 14 50 90 References cite book author Biggs, Norman title Algebraic Graph Theory ... 215 235 title On a problem of graph theory url http www.math inst.hu p erdos 1966 06.pdf volume 1 year 1966 cite book author Hartsfield, Nora Ringel, Gerhard title Pearls in Graph Theory A Comprehensive ...Image Tutte eight cage.svg thumb right The Tutte Coxeter graph Tutte 3,8 cage . In the mathematics mathematical area of graph theory , a cage is a regular graph that has as few vertex graph theory vertices as possible for its girth graph theory girth . Formally, an r , g graph is defined to be a graph in which each vertex has exactly r neighbors, and in which the shortest cycle graph cycle has length exactly g . It is known that an r , g graph exists for any combination of r 2 and g 3. An r , g cage is an r , g graph with the fewest possible number of vertices, among all r , g graphs. If a Moore graph exists with degree r and girth g , it must be a cage. Moreover, the bounds on the sizes of Moore graphs generalize to cages any cage with odd girth g must have at least math 1 r sum i 0 g 3 2 ... vertices. Any r , g graph with exactly this many vertices is by definition a Moore graph and therefore ... graph K sub r 1 sub on r 1 vertices, and the r ,4 cage is a complete bipartite graph K sub r , r sub on 2 r vertices. Other notable cages include the Moore graphs 3,5 cage the Petersen graph , 10 vertices 3,6 cage the Heawood graph , 14 vertices 3,8 cage the Tutte Coxeter graph , 30 vertices 3,10 cage the Balaban 10 cage , 70 vertices 7,5 cage The Hoffman Singleton graph , 50 vertices. The numbers ... D. A. Holton and J. Sheehan title The Petersen Graph publisher Cambridge University Press year 1993 ... title Cage Graph urlname CageGraph Category Graph families Category Regular graphs fr Cage th orie ...   more details



  1. Extremal graph theory

    Extremal graph theory is a branch of the mathematics mathematical field of graph theory . Extremal graph theory studies extremal maximal or minimal Graph mathematics graphs which satisfy a certain property. Extremality can be taken with respect to different graph invariant s, such as order, size or girth. More abstractly, it studies how global properties of a graph influence local substructures of the graph. ref harvnb Diestel 2005 ref For example, a simple extremal graph theory question is which Forest graph theory acyclic graph s on n vertices have the maximum number of edges? The extremal graphs for this question are tree graph theory trees on n vertices, which have n   &minus   1 edges. ref Harvnb Bollob s 2004 p 9 ref More generally, a typical question is the following. Given a graph .... Thus every graph on n vertices with more than n   &minus   1 edges must contain a cycle. Several foundational results in extremal graph theory are questions of the above mentioned form ... a clique graph theory clique of size k is answered by Tur n s theorem . Instead of cliques ... Stone theorem . History Quote box quote Extremal graph theory, in its strictest sense, is a branch of graph theory developed and loved by Hungarians. source Harvtxt Bollob s 2004 width 300px Extremal graph theory started in 1941 when Tur n proved Tur n s theorem his theorem determining those graphs ... cycle . See also Ramsey theory Notes references References Citation last1 Bollob s first1 B la author1 link B la Bollob s title Extremal Graph Theory publisher Dover Publications location New ... title Modern Graph Theory publisher Springer Verlag location Berlin, New York isbn 978 0 387 98491 9 year 1998 pages 103 144 . Citation last1 Diestel first1 Reinhard title Graph Theory url http www.math.uni ... summer school lectures, 2006. http www.renyi.hu miki BerlinG.pdf Category Extremal graph theory ... such that every graph in H which has u larger than m possess property P . In the example above, H was the set ...   more details



  1. Degree (graph theory)

    Image UndirectedDegrees Loop .svg thumb A graph with vertices labeled by degree In graph theory , the degree or valency of a vertex graph theory vertex of a graph mathematics graph is the number of edge graph theory edges incidence graph theory incident to the vertex, with loop graph theory loop s counted ... of tree graph theory tree s in graph theory and especially tree data structure tree s as data ... , any graph other than a clique or an odd cycle has chromatic number at most  , and by Vizing s theorem any graph has chromatic index at most     1. A Degeneracy graph theory k degenerate ... Diestel first1 Reinhard title Graph Theory url http www.math.uni hamburg.de home diestel books graph.theory ... Theory 15, No. 2 1991 223&ndash 231. Category Graph theory cs Stupe vrcholu de Nachbarschaft ... degree of a graph G , denoted by G , and the minimum degree of a graph, denoted by G , are the maximum and minimum degree of its vertices. In the graph on the right, the maximum degree is 5 and the minimum degree is 0. In a regular graph , all degrees are the same, and so we can speak of the degree of the graph. Handshaking lemma main handshaking lemma The degree sum formula states that, given a graph math G V, E math , math sum v in V deg v 2 E , . math The formula implies that in any graph, the number of vertices with odd degree is even. This statement as well as the degree sum ... graph is the non increasing sequence of its vertex degrees ref Diestel p.278 ref for the above graph it is 5, 3, 3, 2, 2, 1, 0 . The degree sequence is a graph invariant so Graph isomorphism ..., uniquely identify a graph in some cases, non isomorphic graphs have the same degree sequence ... realized by adding an appropriate number of isolated vertices to the graph. A sequence which is the degree sequence of some graph, i.e. for which the degree sequence problem has a solution ... with a given degree sequence is a problem from the field of graph enumeration . As a consequence ...   more details




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