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46C15 Characterizations of Hilbert spaces (6 articles)

• Pangalela, Yosafat E. P.; Gunawan, Hendra: The $n$-dual space of the space of $p$-summable sequences. (English). Mathematica Bohemica, vol. 138 (2013), issue 4, pp. 439-448
• Martini, Horst; Spirova, Margarita: A new type of orthogonality for normed planes. (English). Czechoslovak Mathematical Journal, vol. 60 (2010), issue 2, pp. 339-349
• Alsina, C.; Cruells, P.; Tomás, M. S.: Characterizations of inner product spaces through an isosceles trapezoid property. (English). Archivum Mathematicum, vol. 35 (1999), issue 1, pp. 21-27
• Şerb, Ioan: Rectangular modulus, Birkhoff orthogonality and characterizations of inner product spaces. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 40 (1999), issue 1, pp. 107-119
• Alsina, C.; Guijarro, P.; Tomás, M. S.: Characterizations of inner product structures involving the radius of the inscribed or circumscribed circumference. (English). Archivum Mathematicum, vol. 32 (1996), issue 3, pp. 233-239
• Fitzpatrick, Simon; Calvert, Bruce: Sets invariant under projections onto two dimensional subspaces. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 32 (1991), issue 2, pp. 233-239