Asboei, A.K.; Amiri, S.S.S.; Iranmanesh, A.
(Український математичний журнал, 2015)
Let G be a finite group and let π e (G) be the set of orders of elements from G. Let k ∈ π e (G) and let m k be the number of elements of order k in G. We set nse (G) := {m k | k ∈ π e (G)}. It is proved that PSL(2, q) are ...