> < ^ From:

> < ^ Subject:

Dear Gap Forum,

Igor Schein wrote:

Thanks a lot, that's exactly what I needed. Now I can answer my original

question:gap> IsomorphicSubgroups(SmallGroup(32,29),SmallGroup(8,4)); [ [ f1, f2 ] -> [ f1, f2 ], [ f1, f2 ] -> [ f1*f5, f1*f2 ] ]So SmallGroup(32,29) indeed contains a quaterunion subgroup.

As the person who wrote this function, let me just add that

`IsomorphicSubgroups' tries to find possible images of a generating set. If

the group you want to embed has many generators (for example if it is

elementary abelian) this is likely to become slow and a method more along

thelines of Joachim Neub"users first suggestion will be better.

I don't understand this though:

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ gap> IsomorphicSubgroups(SmallGroup(32,29),SmallGroup(4,1)); List Element: <list>[1] must have an assigned value at return i[1];Why error?

I was not able to reproduce the problem in 4r2fix8, but if I remember

correctly we had such a problem (with cyclic groups?) a while ago which

got corrected in a bugfix. Could you check whether you have up to fix 8

installed? (If yes, and the problem still arises, please esend us a mail at

gap-trouble@dcs.st-and.ac.uk and we will investigate.)

Best regards,

Alexander Hulpke

-- Colorado State University, Department of Mathematics,

Weber Building, Fort Collins, CO 80523, USA

email: hulpke@math.colostate.edu, Phone: ++1-970-4914288

http://www.math.colostate.edu/~hulpke

Miles-Receive-Header: reply

> < [top]