> < ^ Date: Fri, 30 Apr 1993 09:48:39 +0200
> < ^ From: Alexander Hulpke <hulpke@math.colostate.edu >
< ^ Subject: Re: Finding subgroups in GAP

In his message, Chad Scherrer asked:

Is there a way in GAP to find all the subgroups of a given group, and if so,
what about finding all normal subgroups of a given group?

GAP provides routines for both tasks. Subgroups are computed using the
'Lattice' command, which computes the whole lattice of subgroups (and
stores conjugated subgroups is a somehow shortened form). In case you
really want to have a list of all subgroups for looping over them, you
might use

l:=Lattice(g); # supposing g is your group

Then the variable 's' will contain a list of all subgroups. If you
replace 'Elements' by 'Representative', you will obtain a list of
representatives of each conjugacy class of subgroups.

For computing all normal subgroups, GAP provides the command


Alexander Hulpke

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