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Generalized Tur\'an problem with bounded matching number
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abstract
For a graph $T$ and a set of graphs $\mathcal{H}$, let $\mbox{ex}(n,T,\mathcal{H})$ denote the maximum number of copies of $T$ in an $n$-vertex $\mathcal{H}$-free graph. Recently, Alon and Frankl~(arXiv2210.15076) determined the exact value of $\mbox{ex}(n,K_2,\{K_{k+1},M_{s+1}\})$, where $K_{k+1}$ and $M_{s+1}$ are complete graph on $k+1$ vertices and matching of size $s+1$, respectively. Soon after, Gerbner~(arXiv2211.03272) continued the study by extending $K_{k+1}$ to general fixed graph $H$. In this paper, we continue the study of the function $\mbox{ex}(n, T,\{H,M_{s+1}\})$ when $T=K_r$ for $r\ge 3$. We determine the exact value of $\mbox{ex}(n,K_r,\{K_{k+1},M_{s+1}\})$ and give the value of $\mbox{ex}(n,K_r,\{H,M_{s+1}\})$ for general $H$ with an error term $O(1)$.
Forward citations
Cited by 2 Pith papers
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Tur\'an numbers of cycles plus a general graph
The Turan number ex(n,{C>=k,F}) is determined up to an additive constant for every 2-connected F with p(F) at least floor((k-1)/2)+1; the even-k formula is n times the larger of (k-2)/2 and ex(k-1,F)/(k-2), plus O_k(1).
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Survey of generalized Tur\'an problems -- counting subgraphs
A survey of what is known about maximizing the count of one fixed subgraph in graphs that avoid another fixed subgraph.
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