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Fix a rare error message in isomorphism test #5298

Merged
merged 5 commits into from
Jan 10, 2023
Merged

Fix a rare error message in isomorphism test #5298

merged 5 commits into from
Jan 10, 2023

Commits on Jan 10, 2023

  1. ENHANCE: Use permrep of cosets for ctblgrp 

    Double cosets in Dixon-Schneider can use coset perm action, if degree is
small
    @hulpke @fingolfin
    hulpke authored and fingolfin committed Jan 10, 2023
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  2. ENHANCE: FittingFreeSubgroupSetup cache and method 

    use presentation for factor and closure, rather than coKernelGenerators.
This requires fewer products in preimage.
    @hulpke @fingolfin
    hulpke authored and fingolfin committed Jan 10, 2023
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  3. FIX: Isomorphism test series not fixed 

    when inserting certain subgroups. This fixes a bug reported by B. Sambale in
the forum on 12/24/2022
    @hulpke @fingolfin
    hulpke authored and fingolfin committed Jan 10, 2023
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  4. FIX: Mixed factor group representation 

    can lead no natural homomorphism into formal direct product, not efficient.
    @hulpke @fingolfin
    hulpke authored and fingolfin committed Jan 10, 2023
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  5. ENHANCE: Better permrep for pc groups 

    This is relevant when forming factor groups as subdirect products.
    @hulpke @fingolfin
    hulpke authored and fingolfin committed Jan 10, 2023
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