On approximation of topological groups by finite algebraic systems

Details On approximation of topological groups by finite algebraic systems On approximation of topological groups by finite algebraic systems

2002-01-11

arxiv.org/abs/math/0201101v1

Mathematics

Group Theory

to be sent to Proceedings of AMS

Scientific paper

It is known that locally compact groups approximable by finite ones are unimodular, but this condition is not sufficient, for example, the simple Lie groups are not approximable by finite ones as topological groups. In this paper the approximations of locally compact groups by more general finite algebraic systems are investigated. It is proved that the approximation of locally compact groups by finite semigroups is equivalent to approximation by finite groups and thus not all locally compact groups are approximable by finite semigroups. We prove that any locally compact group is approximable by finite left (right) quasigroups but the approximabilty of a locally compact group by finite quasigroups (latin squares) implies its unimodularity. The question if the unimodularity of a locally compact group implies its approximability by finite quasigroups is open. We prove only that the discrete groups are approximable by finite quasigroups.

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