Komuro, Naoto; Saito, Kichi-Suke; Tanaka, Ryotaro A characterization of Radon planes using generalized Day-James spaces. (English) Zbl 1452.46016 Ann. Funct. Anal. 11, No. 1, 62-74 (2020). MSC: 46B20 52A21 PDFBibTeX XMLCite \textit{N. Komuro} et al., Ann. Funct. Anal. 11, No. 1, 62--74 (2020; Zbl 1452.46016) Full Text: DOI
Komuro, Naoto; Saito, Kichi-Suke; Tanaka, Ryotaro On symmetry of Birkhoff orthogonality in the positive cones of \(C^{\ast}\)-algebras with applications. (English) Zbl 1423.46024 J. Math. Anal. Appl. 474, No. 2, 1488-1497 (2019). MSC: 46B20 46L05 PDFBibTeX XMLCite \textit{N. Komuro} et al., J. Math. Anal. Appl. 474, No. 2, 1488--1497 (2019; Zbl 1423.46024) Full Text: DOI
Komuro, Naoto; Saito, Kichi-Suke; Tanaka, Ryotaro Left symmetric points for Birkhoff orthogonality in the preduals of von Neumann algebras. (English) Zbl 1412.46026 Bull. Aust. Math. Soc. 98, No. 3, 494-501 (2018). MSC: 46B20 46L99 PDFBibTeX XMLCite \textit{N. Komuro} et al., Bull. Aust. Math. Soc. 98, No. 3, 494--501 (2018; Zbl 1412.46026) Full Text: DOI
Komuro, Naoto; Saito, Kichi-Suke; Tanaka, Ryotaro A sufficient condition that \(J(X^\ast)=J(X)\) holds for a Banach space \(X\). (English) Zbl 1408.46019 Tokyo J. Math. 41, No. 1, 219-223 (2018). MSC: 46B20 PDFBibTeX XMLCite \textit{N. Komuro} et al., Tokyo J. Math. 41, No. 1, 219--223 (2018; Zbl 1408.46019) Full Text: DOI
Komuro, Naoto; Mitani, Ken-Ichi; Saito, Kichi-Suke; Tanaka, Ryotaro; Tomizawa, Yukino A comparison between James and von Neumann-Jordan constants. (English) Zbl 1384.46011 Mediterr. J. Math. 14, No. 4, Paper No. 168, 13 p. (2017). MSC: 46B20 PDFBibTeX XMLCite \textit{N. Komuro} et al., Mediterr. J. Math. 14, No. 4, Paper No. 168, 13 p. (2017; Zbl 1384.46011) Full Text: DOI
Komuro, Naoto; Saito, Kichi-Suke; Tanaka, Ryotaro On the class of Banach spaces with James constant \(\sqrt 2\). II. (English) Zbl 1362.46013 Mediterr. J. Math. 13, No. 6, 4039-4061 (2016). MSC: 46B20 PDFBibTeX XMLCite \textit{N. Komuro} et al., Mediterr. J. Math. 13, No. 6, 4039--4061 (2016; Zbl 1362.46013) Full Text: DOI
Komuro, Naoto; Saito, Kichi-Suke; Tanaka, Ryotaro On the class of Banach spaces with James constant \(\sqrt{2}\). (English) Zbl 1354.46019 Math. Nachr. 289, No. 8-9, 1005-1020 (2016). Reviewer: Barry Turett (Rochester) MSC: 46B20 46C15 PDFBibTeX XMLCite \textit{N. Komuro} et al., Math. Nachr. 289, No. 8--9, 1005--1020 (2016; Zbl 1354.46019) Full Text: DOI
Saito, Kichi-Suke; Tanaka, Ryotaro New geometric properties of Banach spaces. (English) Zbl 1338.46023 Math. Nachr. 288, No. 10, 1163-1178 (2015). Reviewer: Barry Turett (Rochester) MSC: 46B20 PDFBibTeX XMLCite \textit{K.-S. Saito} and \textit{R. Tanaka}, Math. Nachr. 288, No. 10, 1163--1178 (2015; Zbl 1338.46023) Full Text: DOI
Saito, Kichi-Suke; Sato, Masahiro; Tanaka, Ryotaro When does the equality \(J(X^*)=J(X)\) hold for a two-dimensional Banach space \(X\)? (English) Zbl 1339.46013 Acta Math. Sin., Engl. Ser. 31, No. 8, 1303-1314 (2015). MSC: 46B20 PDFBibTeX XMLCite \textit{K.-S. Saito} et al., Acta Math. Sin., Engl. Ser. 31, No. 8, 1303--1314 (2015; Zbl 1339.46013) Full Text: DOI
Sano, Hiroki; Izumida, Tamotsu; Mitani, Ken-Ichi; Ohwada, Tomoyoshi; Saito, Kichi-Suke Characterization of intermediate values of the triangle inequality. II. (English) Zbl 1310.46020 Cent. Eur. J. Math. 12, No. 5, 778-786 (2014). MSC: 46B20 26D20 PDFBibTeX XMLCite \textit{H. Sano} et al., Cent. Eur. J. Math. 12, No. 5, 778--786 (2014; Zbl 1310.46020) Full Text: DOI
Tanaka, Ryotaro; Saito, Kichi-Suke Orthonormal bases and a structure of finite dimensional normed linear spaces. (English) Zbl 1300.46017 Banach J. Math. Anal. 8, No. 1, 89-97 (2014). MSC: 46B20 46B25 46B15 PDFBibTeX XMLCite \textit{R. Tanaka} and \textit{K.-S. Saito}, Banach J. Math. Anal. 8, No. 1, 89--97 (2014; Zbl 1300.46017) Full Text: DOI Euclid
Mizuguchi, Hiroyasu; Saito, Kichi-Suke; Tanaka, Ryotaro The Dunkl-Williams constant of symmetric octagonal norms on \(\mathbb{R}^2\). (English) Zbl 1267.46029 Nihonkai Math. J. 23, No. 2, 93-113 (2012). MSC: 46B20 52A21 PDFBibTeX XMLCite \textit{H. Mizuguchi} et al., Nihonkai Math. J. 23, No. 2, 93--113 (2012; Zbl 1267.46029) Full Text: Euclid