Article ID Journal Published Year Pages File Type
4591013 Journal of Functional Analysis 2011 8 Pages PDF
Abstract

We show that any countable subgroup of the multiplicative group of positive real numbers can be realized as the fundamental group F(A) of a separable simple unital C⁎-algebra A with unique trace. Furthermore for any fixed countable subgroup G of , there exist uncountably many mutually nonisomorphic such algebras A with G=F(A).

Related Topics
Physical Sciences and Engineering Mathematics Algebra and Number Theory