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1. CMB 2005 (vol 48 pp. 97)

Katavolos, Aristides; Paulsen, Vern I.
On the Ranges of Bimodule Projections
We develop a symbol calculus for normal bimodule maps over a masa that is the natural analogue of the Schur product theory. Using this calculus we are easily able to give a complete description of the ranges of contractive normal bimodule idempotents that avoids the theory of J*-algebras. We prove that if $P$ is a normal bimodule idempotent and $\|P\| < 2/\sqrt{3}$ then $P$ is a contraction. We finish with some attempts at extending the symbol calculus to non-normal maps.

Categories:46L15, 47L25

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