Using matched projections m(Q) of idempotents Q, the paper gives complete distance characterizations to projections, explicit 4x4 block forms for C*{Q}, and new numerical range descriptions.
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Some applications of the matched projections of idempotents
Using matched projections m(Q) of idempotents Q, the paper gives complete distance characterizations to projections, explicit 4x4 block forms for C*{Q}, and new numerical range descriptions.