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Uniqueness of the extreme cases in theorems of Drisko and Erd\H{o}s-Ginzburg-Ziv by Aharoni, Ron; Kotlar, Dani; Ziv, Ran is a scholarly article available to read on EtoBox.

What is Uniqueness of the extreme cases in theorems of Drisko and Erd\H{o}s-Ginzburg-Ziv about?

Drisko \cite{drisko} proved (essentially) that every family of $2n-1$ matchings of size $n$ in a bipartite graph possesses a partial rainbow matching of size $n$. In \cite{bgs} this was generalized as follows: Any $\lfloor \frac{k+2}{k+1} n \rfloor -(k+1)$ matchings of size $n$ in a bipartite graph have a rainbow matching of size $n-k$. We extend this latter result to matchings of not necessarily equal cardinalities. Settling a conjecture of Drisko, we characterize those families of $2n-2$ matchings of size $n$ in a bipartite graph that do not possess a rainbow matching of size $n$. Combining this with an idea of Alon \cite{alon}, we re-prove a characterization of the extreme case in a well-known theorem of Erd\H{o}s-Ginzburg-Ziv in additive number theory.

Author

Aharoni, Ron; Kotlar, Dani; Ziv, Ran

Published

2015

Language

EN