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Currently displaying 1 – 4 of 4

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Some results on non-commutative Banach function spaces.

Keiichi Watanabe — 1992

Mathematische Zeitschrift

A note on a class of Banach algebra-valued polynomials.

Takahasi, Sin-Ei; Hatori, Osamu; Watanabe, Keiichi; Miura, Takeshi — 2002

International Journal of Mathematics and Mathematical Sciences

Another consequence of tanahashi’s argument on best possibility of the grand Furuta inequality

Tatsuya Koizumi; Keiichi Watanabe — 2013

Open Mathematics

We show that Tanahashi’s argument on best possibility of the grand Furuta inequality has an additional consequence.

Isometries between groups of invertible elements in C*-algebras

Osamu Hatori; Keiichi Watanabe — 2012

Studia Mathematica

We describe all surjective isometries between open subgroups of the groups of invertible elements in unital C*-algebras. As a consequence the two C*-algebras are Jordan *-isomorphic if and only if the groups of invertible elements in those C*-algebras are isometric as metric spaces.

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