Operator Algebra Seminars

Fri., Oct. 19, 2018 1:30 p.m. - Fri., Oct. 19, 2018 2:30 p.m.

Location: Classroom Building (CL) 416

Speaker: Kenneth R. Davidson, University of Waterloo

Title: Free Semigroupoid Algebras

Abstract:

A free semigroupoid algebra is the WOT-closure of the algebra generated by a Toeplitz-Cuntz-Kreiger family of a graph. We obtain a structure theory for these algebras analogous to that of free semigroup algebra. These results are applied to obtain a Lebesgue-von Neumann-Wold decomposition of TCK families, along with reflexivity, a Kaplansky density theorem and classification for free semigroupoid algebras. Several classes of examples are discussed.

This is joint work with Adam Dor-On and Boyu Li.