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math.MG2008
A congruence problem for polyhedra
Alexander Borisov, Mark Dickinson, Stuart Hastings
It is well known that to determine a triangle up to congruence requires three measurements: three sides, two sides and the included angle, or one side and two angles. We consider v…
math.GR2008
Polynomial maps over -adics and residual properties of mapping tori of group endomorphisms
Alexander Borisov, Mark Sapir
We continue our study of residual properties of mapping tori of free group endomorphisms. In this paper, we prove that each of these groups are virtually residually (finite )-gr…