Distance Between Unitary Orbits of Self-AdjointElements in C*-Algebras of Tracial Rank One

Citation:

Ruofei WANG.Distance Between Unitary Orbits of Self-AdjointElements in C*-Algebras of Tracial Rank One[J].Chinese Annals of Mathematics B,2023,44(3):407~444
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Authors:

Ruofei WANG;
Abstract: The note studies certain distance between unitary orbits. A result about Riesz interpolation property is proved in the first place. Weyl (1912) shows that dist(U(x), U(y)) = δ(x, y) for self-adjoint elements in matrixes. The author generalizes the result to C*-algebras of tracial rank one. It is proved that dist(U(x), U(y)) = Dc(x, y) in unital AT -algebras and in unital simple C*-algebras of tracial rank one, where x, y are self-adjoint elements and Dc (x, y) is a notion generalized from δ(x, y).

Keywords:

Unitary orbits, Riesz interpolation property, Tracial rank one, Dc(x, y)

Classification:

46L05
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