The Size of a Graph Without Topological Complete Subgraphs

Extremal Graphs without Topological Complete Subgraphs

On Subgraphs of the Complete Bipartite Graph

G(n) denotes a graph of n vertices and G(n) denotes its complementary graph. In a complete graph every two distinct vertices are joined by an edge. Let C k (G(n)) denote the number of complete subgraphs of k vertices contained in G(n). Recently it was proved [1] that for every k 2 (n) (1) min C (G (n)) + Ck(G(n)) < k k, , ! 2 2 where the minimum is over all graphs G(n). It seems likely that (1)...

On Complete Topological Subgraphs of Certain Graphs

Let G he a graph . We say that G contains a complete k-gon if there are !c vertices of G any two of which are connected by an edge, we say that it contains a complete topological k-gon if it contains k vertices any two of which are connected by paths no two of which have a common vertex (except endpoints) . Following G . DIRAC we will denote complete k-gons by -k = and complete topological k-go...

The Maximum Number of Complete Subgraphs of Fixed Size in a Graph with Given Maximum Degree

In this paper, we make progress on a question related to one of Galvin that has attracted substantial attention recently. The question is that of determining among all graphs G with n vertices and ∆(G) ≤ r, which has the most complete subgraphs of size t, for t ≥ 3. The conjectured extremal graph is aKr+1 ∪Kb, where n = a(r + 1) + b with 0 ≤ b ≤ r. Gan, Loh, and Sudakov proved the conjecture wh...

On the number of complete subgraphs of a graph II

Generalizing some results of P . ERnbs and sonic of L . MosER and J. W. MOON we give lower bounds *on the number of complete p-graphs K p of,graphs in terms of the numbers of vertices and edges. Further, for some values of n and E we give a complete characterization of the extremal graphs, i.e. the graphs S of n vertices and E edges having minimum number of K,'s. Our results contain the proof o...