His most significant result is the research and of unitary and nonunitary dual group SU(n, 1), index generalization for semisimple Banach algebras, contributions to the research of Landau-type inequalities for infinitesimal generators to the theory of almost-summability.
Graham Robert Allan, mathematician and an expert on Banach algebras, Professor of Pure Mathematics from 1970-8 at the University of Leeds
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