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math.CO2010
On the grasshopper problem with signed jumps
Géza Kós
The 6th problem of the 50th International Mathematical Olympiad (IMO), held in Germany, 2009, was the following. Let be distinct positive integers and let be…
math.CO2010★ 2 cited
Alon's Nullstellensatz for multisets
Géza Kós, Lajos Rónyai
Alon's combinatorial Nullstellensatz (Theorem 1.1 from \cite{Alon1}) is one of the most powerful algebraic tools in combinatorics, with a diverse array of applications. Let $\F$ be…