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Generalized Tur\'an problems for a matching and long cycles

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arxiv 2412.18853 v1 pith:SMM6QKTU submitted 2024-12-25 math.CO

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abstract

Let $\mathscr{F}$ be a family of graphs. A graph $G$ is $\mathscr{F}$-free if $G$ does not contain any $F\in \mathcal{F}$ as a subgraph. The general Tur\'an number, denoted by $ex(n, H,\mathscr{F})$, is the maximum number of copies of $H$ in an $n$-vertex $\mathscr{F}$-free graph. Then $ex(n, K_2,\mathscr{F})$, also denote by $ex(n, \mathscr{F})$, is the Tur\'an number. Recently, Alon and Frankl determined the exact value of $ex(n, \{K_{k},M_{s+1}\})$, where $K_{k}$ and $M_{s+1}$ are a complete graph on $k $ vertices and a matching of size $s +1$, respectively. Then many results were obtained by extending $K_{k}$ to a general fixed graph or family of graphs. Let $C_k$ be a cycle of order $k$. Denote $C_{\ge k}=\{C_k,C_{k+1},\ldots\}$. In this paper, we determine the value of $ex(n,K_r, \{C_{\ge k},M_{s+1}\})$ for large enough $n$ and obtain the extremal graphs when $k$ is odd. Particularly, the exact value of $ex(n, \{C_{\ge k},M_{s+1}\})$ and the extremal graph are given for large enough $n$.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Spectral extremal problems for degenerate graphs

    math.CO 2025-07 conditional novelty 7.0 of 10

    For finite degenerate graph families with linear ex(n,F), the spectral extremal graph is characterized by the independent covering number β'(F) and the induced family H(F).

  2. Survey of generalized Tur\'an problems -- counting subgraphs

    math.CO 2025-06 conditional novelty 2.0 of 10

    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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