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math.CO2019★ 2 cited
Jordan-Hölder with uniqueness for semimodular semilattices
Pavel Paták
We present a short proof of the Jordan-Hölder theorem with uniqueness for semimodular semilattice: Given two maximal chains in a semimodular semilattice of finite height, they both…
math.CO2019
A sharper Ramsey theorem for constrained drawings
Pavel Paták
Given a graph and a collection of subsets of indexed by the subsets of vertices of , a constrained drawing of is a drawing, where each edge i…