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math.OA2018
When is Every Quasi-Multiplier a Multiplier?
Lawrence G. Brown
We answer the title question for sigma-unital C*-algebras. The answer is that the algebra must be the direct sum of a dual C*-algebra and a C*-algebra satisfying a certain local un…
math.OA2018
On the property IR of Friis and Rordam
Lawrence G. Brown
In a 1997 paper Lin solved a longstanding problem as follows: For each epsilon > 0, there is delta > 0 such that if h and k are self-adjoint contractive n x n matrices and ||hk - k…