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math.LO2026
Extension properties for partial permutations
Mahmood Etedadialiabad, Su Gao
Motivated by the EPPA problem for finite tournaments,we consider various extension properties for partial permutations. We show that for any set of prime numbers, the -exten…
math.LO2026
Borel graphs generated by commuting functions
Su Gao, Xiangxi Hu, Jie Zou
In this paper we study Borel graphs generated by finitely many commuting Borel functions. We give a geometric analysis of the free part of such graphs based on marker sets and mark…