Trace functions on the algebras of certain E-unitary inverse semigroups
M. J. Crabb, Walter Douglas Munn · Proceedings of the Royal Society of Edinburgh Section A Mathematics · 1995
A construction is given for a trace function on the semigroup algebra of a certain type of E-unitary inverse semigroup over any subfield of the complex field that is closed under complex conjugation. In particular, the method applies to the semigroup algebras of free inverse semigroups of arbitrary rank.