International Journal of Mathematics and Mathematical Sciences
Volume 11 (1988), Issue 2, Pages 401-402
Research Notes

A convex operator function

Derming Wang

Department of Mathematics and Computer Science, California State University, Long Beach, Long Beach 90840, California, USA

Received 23 September 1987

Copyright © 1988 Derming Wang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


It is shown that inversion is a convex function on the set of strictly positive elements of a C*-algebra.