Algebra Seminar: Voight -- Orders with cancellation

John Voight (University of Sydney) will be speaking in the algebra seminar.  We will go
out for lunch after the talk---all are welcome to join! 

When: 12-1pm Friday March 7 

Where: Carslaw 175 

Title: Orders with cancellation 

Abstract: We consider orders in (possibly noncommutative) semisimple algebras over the
rationals whose associated category of projective modules has a cancellation property.
Examples include the group ring of a finite group over the integers.  We give a
complete characterization in the very interesting case when the algebra is a definite
quaternion algebra over a totally real field.  This is joint work with Daniel Smertnig.