Tracial algebras and an embedding theorem

Details Tracial algebras and an embedding theorem Tracial algebras and an embedding theorem

2010-05-05

arxiv.org/abs/1005.0822v1

Mathematics

Operator Algebras

23 pages, no figures

Scientific paper

We prove that every positive trace on a countably generated *-algebra can be approximated by positive traces on algebras of generic matrices. This implies that every countably generated tracial *-algebra can be embedded into a metric ultraproduct of generic matrix algebras. As a particular consequence, every finite von Neumann algebra with separable pre-dual can be embedded into an ultraproduct of tracial *-algebras, which as *-algebras embed into a matrix-ring over a commutative algebra.

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