The Quarterly Journal of Mathematics 2001 52(2):229-230; doi:10.1093/qjmath/52.2.229
© 2001 by Oxford University Press
Unilaterally Invertible Normals are Invertible
P. G. Spain1
1 Mathematics Department, University of Glasgow, Glasgow G12 8QW, UK. E-mail: pgs@maths.gla.ac.uk
The result stated in the title is a fundamental result about Banach algebras which appears to have escaped notice up to now.

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