ASKSAGE: Sage Q&A Forum - RSS feedhttps://ask.sagemath.org/questions/Q&A Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Wed, 04 Sep 2013 18:37:26 +0200Permutation Groups in Gapshttps://ask.sagemath.org/question/10459/permutation-groups-in-gaps/Hi
I have a group of size 1171875 given by generators and relations in GAP. To compute it's Schur Multiplier, I need a presentation of it as a permutation group. AsPermGroup takes forever (I have run it for over an hour) and I was wondering if there was a faster way.
Thanks!
(BTW I am not sure this is the right place to ask this question! I didn't see a GAP forum out there. If necessary, I can delete this post).Tue, 20 Aug 2013 13:47:54 +0200https://ask.sagemath.org/question/10459/permutation-groups-in-gaps/Comment by Dima for <p>Hi </p>
<p>I have a group of size 1171875 given by generators and relations in GAP. To compute it's Schur Multiplier, I need a presentation of it as a permutation group. AsPermGroup takes forever (I have run it for over an hour) and I was wondering if there was a faster way.</p>
<p>Thanks!</p>
<p>(BTW I am not sure this is the right place to ask this question! I didn't see a GAP forum out there. If necessary, I can delete this post).</p>
https://ask.sagemath.org/question/10459/permutation-groups-in-gaps/?comment=17068#post-id-17068AsPermGroup constructs a regular representation, and indeed, you don't want a group of degree over 10^6. Do you know a small index (say, less tham 10000) subgroup in your group (such that the it does not contain a normal subgroup)? Enumerate cosets over it, this should be quick and give you a low degree permutation group to work with.Wed, 04 Sep 2013 08:12:04 +0200https://ask.sagemath.org/question/10459/permutation-groups-in-gaps/?comment=17068#post-id-17068Comment by Dima for <p>Hi </p>
<p>I have a group of size 1171875 given by generators and relations in GAP. To compute it's Schur Multiplier, I need a presentation of it as a permutation group. AsPermGroup takes forever (I have run it for over an hour) and I was wondering if there was a faster way.</p>
<p>Thanks!</p>
<p>(BTW I am not sure this is the right place to ask this question! I didn't see a GAP forum out there. If necessary, I can delete this post).</p>
https://ask.sagemath.org/question/10459/permutation-groups-in-gaps/?comment=17058#post-id-17058GAP has an email-based forum (http://gap-system.org/Contacts/Forum/forum.html). You can subscribe to it and ask there.Wed, 04 Sep 2013 18:37:26 +0200https://ask.sagemath.org/question/10459/permutation-groups-in-gaps/?comment=17058#post-id-17058