The unbounded commutant of an operator of class C_0

Details The unbounded commutant of an operator of class C_0 The unbounded commutant of an operator of class C_0

2009-08-16

arxiv.org/abs/0908.2262v1

Mathematics

Functional Analysis

Scientific paper

We describe the closed, densely defined linear transformations commuting with
a given operator T of class C_0 in terms of bounded operators in {T}'. Our
results extend those of Sarason for operators with defect index 1, and Martin
in the case of arbitrary finite index.

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