Normalizer causes seg fault

Issue #97 resolved
James Mitchell
repo owner created an issue
gap> Normalizer(SymmetricGroup(3), Semigroup(IdentityTransformation));
[  ]
Segmentation fault: 11

This is because the kernel function POW_KER_PERM(ker, p) assumes that its 2nd argument (a permutation) acts on [1..Length(ker)], which in the case above, it does not.

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