Abstract
The extremal number ex(n;{C3,C4}) or simply ex(n;4) denotes the maximal number of edges in a graph on n vertices with forbidden subgraphs C3 and C4. The exact number of ex(n;4) is only known for n up to 32 and n=50. There are upper and lower bounds of ex(n;4) for other values of n. In this paper, we improve the upper bound of ex(n;4) for n=33,34,…,42 and also n=d2+1 for any positive integer d≠7,57.
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