On redundant Sylow subgroups

Abstract

A Sylow p-subgroup P of a finite group G is called redundant if every p-element of G lies in a Sylow subgroup different from P. Generalizing a recent theorem of Maróti--Martínez--Moretó, we show that for every non-cyclic p-group P there exists a solvable group G such that P is redundant in G. Moreover, we answer several open questions raised by Maróti--Martínez--Moretó.

7 pages, v4: minor corrections and improvements