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ENHANCE: Faster MaximalAbelianQuotient for subgroups of fp groups #3630

Merged
merged 2 commits into from
Sep 4, 2019
Merged

ENHANCE: Faster MaximalAbelianQuotient for subgroups of fp groups #3630

merged 2 commits into from
Sep 4, 2019

Commits on Sep 1, 2019

  1. ENHANCE: Faster MaximalAbelianQuotient for subgroups of fp groups 

    Use abelianized rewriting rather than go though IsomorphismFpGroup.
Also added heuristic relator matrix reduction (not full HNF)
to use before SNF to speed up.

Also use in case that kernel Abelian Rrs fails.

LargerQuotientBySubgroupAbelianization will not calculate subgroup lattice
to avoid overkill.
    @hulpke
    hulpke committed Sep 1, 2019
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  2. FIX: Removed dodgy redundant structure settings. 

    This resolves gap-system#3634
    @hulpke
    hulpke committed Sep 1, 2019
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