Three small fixes from working with U4(3) #5545
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When acting on subgroups in a smaller degree, translate back properly. Also don't do so for neglegible benefit.
that act more than cyclic on radical factor. The code might forget about generators needed for some factors.
hulpke
added
kind: bug: unexpected error
Can occur in `AbelianInvariantsMultiplier`.
hulpke
changed the title
fingolfin
approved these changes
Jan 3, 2024
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Fix for action on subgroups through smaller degree, as well as generator selection for building a rewriting system of a group, and calculation of Schur Multiplier Invariants
All lead to error messages.
The example in which I found them is to take G=Aut(U4(3)) and to calculate the subgroup lattice and
IsomorphismFpGroupForRewritingfor it, respectively to calculateAbelianInvariantsMultiplierfor U4(3). All seem too large/costly to add to the standard test suite.