Journal of Operator Theory
Volume 37, Issue 2, Spring 1997 pp. 303-309.
On criss-cross commutativityAuthors: Robin Harte
Author institution: Department of Mathematics, Trinity College, Dublin 2, IRELAND
Summary: Equality of the non zero spectrum of products ab and ba of Banach algebra elements extends to many different kinds of joint spectrum for “criss-cross commuting†pairs of tuples.
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