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Automorphism invariance and identities

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arxiv 0812.1359 v2 pith:YMP2SFX5 submitted 2008-12-07 math.GR math.RA

classification math.GRmath.RA
keywords largeholdsidentitiessolvablesubgroupvirtuallyalgebrasapplication
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If an outer (multilinear) commutator identity holds in a large subgroup of a group, then it holds also in a large characteristic subgroup. Similar assertions are valid for algebras and their ideals or subspaces. Varying the meaning of the word "large", we obtain many interesting facts. These results cannot be extended to arbitrary (non-multilinear) identities. As an application, we give a sharp estimate for the `virtual derived length' of (virtually solvable)-by-(virtually solvable) groups.

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  1. Invariant systems of representatives, or The cost of symmetry

    math.CO 2019-08 conditional novelty 6.0 of 10

    Under any group action, a finite system of representatives of size r for a bounded family of sets can be replaced by an invariant system of representatives of size at most r times the maximum set size.

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