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  1. Home > Articles & Issues >
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  3. Binding Number, Toug ...
Article

Binding Number, Toughness and General Matching Extendability in Graphs

Hongliang Lu, Qinglin Yu
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Submitted on
July 31, 2018
Accepted on
December 13, 2018
Published on
January 17, 2019
Last modified on
March 31, 2025
Volume 21
vol. 21:3
Graph Theory
DOI
10.23638/DMTCS-21-3-1
License
Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
Natural Sciences and Engineering Research Council of Canada
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803
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Binding Number, Toughness and General Matching Extendability in Graphs

Hongliang Lu, Qinglin Yu
Abstract
A connected graph $G$ with at least $2m + 2n + 2$ vertices which contains a perfect matching is $E(m, n)$-{\it extendable}, if for any two sets of disjoint independent edges $M$ and $N$ with $|M| = m$ and $|N|= n$, there is a perfect matching $F$ in $G$ such that $M\subseteq F$ and $N\cap F=\emptyset$. Similarly, a connected graph with at least $n+2k+2$ vertices is called $(n,k)$-{\it extendable} if for any vertex set $S$ of size $n$ and any matching $M$ of size $k$ of $G-S$, $G-S-V(M)$ contains a perfect matching. Let $\varepsilon$ be a small positive constant, $b(G)$ and $t(G)$ be the binding number and toughness of a graph $G$. The two main theorems of this paper are: for every graph $G$ with sufficiently large order, 1) if $b(G)\geq 4/3+\varepsilon$, then $G$ is $E(m,n)$-extendable and also $(n,k)$-extendable; 2) if $t(G)\geq 1+\varepsilon$ and $G$ has a high connectivity, then $G$ is $E(m,n)$-extendable and also $(n,k)$-extendable. It is worth to point out that the binding number and toughness conditions for the existence of the general matching extension properties are almost same as that for the existence of perfect matchings. Comment: 10 pages
Keywords
  • Mathematics - Combinatorics
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