Finding the hypercenter of a finite group in GAP

Question

I usually find the hypercenter of a finite group by the command

Hypercenter:=Union(UpperCentralSeries(g));

Its look odd, since I take the union of all the $i$th center of $g$ and "Hypercenter" is treated as a set and not as a subgroup. Is there any other way to find the hypercentral of a finite group?

Thanks for any help?

Answer 1

Try

Hypercenter := UpperCentralSeries(g)[1];