Patch is here:
https://github.com/martinbaker/fricasAlgTop/blob/master/permgrps1.patch
File is here:
https://github.com/martinbaker/fricasAlgTop/blob/master/permgrps.spad
It is used like this:
permgp := dihedralGroup(3)$PermutationGroupExamples
(1) <(1 2 3),(1 3)>
Type: PermutationGroup(Integer)
permgp::GroupPresentation
(2)
<a b |
a*a*a, a*a*b*a*a*b, a*a*b*a*a*-b, a*b*a*b, a*b*a*-b, b*b,
a*a*b*-a*b
,
a*b*-a*-a*b, b*a*a*-b*-a, a*a*b*-a*-b, a*a*-b*a*a*-b, a*-b*a*-b
>
Type: GroupPresentation
As discussed before, improvements to simplification in GroupPresentation
would be good but that is not part of this code.
Martin B
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