Locally Minimal Projections

Mathematics – Operator Algebras

Scientific paper

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12 pages, AMS TeX

Scientific paper

Given an n-tuple {a_1, ..., a_n} of self-adjoint operators on an infinite
dimensional Hilbert space H and a positive integer k, there exists a projection
p of rank k such that, for each for j = 1, ..., n, pa_jp is a scalar multiple
of p. Assuming that {a_1, ...,a_n, 1} is a linearly independent set in the
Calkin algebra, then p can be chosen of infinite rank.

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