Ryotaro Tanaka

activity

20162026

most citedA solution to Tingley's problem for isometries between the unit spheres of compact C

^{*}

-algebras and JB

^{*}

-triples

43 citations · 44 across the 2 of their papers we have counts for

collaborators

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3 papers · 1 filter

math.FA2026

Nonisomorphic separable Banach spaces at Lipschitz distance one

Ryotaro Tanaka

We construct nonisomorphic separable real Banach spaces whose multiplicative Lipschitz distance is one. Building on OpenAI's graph-space construction, we arrange two sequences of g…

math.FA2021★ 1 cited

On Birkhoff-James orthogonality preservers between real non-isometric Banach spaces

Ryotaro Tanaka

Real smooth three-dimensional or higher Banach spaces are isomorphic with respect to the nonlinear structure of Birkhoff-James orthogonality if and only if they are isometrically i…

math.FA2016★ 43 cited

A solution to Tingley's problem for isometries between the unit spheres of compact C $^{}$ -algebras and JB $^{}$ -triples

Antonio M. Peralta, Ryotaro Tanaka

Let $f : S (E) \to S (B)$ be a surjective isometry between the unit spheres of two weakly compact JB $^{*}$ -triples not containing direct summands of rank smaller than or equal to 3. Sup…

Nonisomorphic separable Banach spaces at Lipschitz distance one

On Birkhoff-James orthogonality preservers between real non-isometric Banach spaces

A solution to Tingley's problem for isometries between the unit spheres of compact C∗-algebras and JB∗-triples

A solution to Tingley's problem for isometries between the unit spheres of compact C $^{}$ -algebras and JB $^{}$ -triples