Orthogonality equation with two unknown functions von Chmieliski, Jacek

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Normed spaces equivalent to inner product spaces and stability of functional equations von Chmieliski, Jacek

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On functional equations related to additive mappings and isometries von Chmieliski, Jacek

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On a [rho]-orthogonality von Chmieliski, Jacek, Wójcik, Pawe

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On a ρ-orthogonality von Chmieliski, Jacek, Wojcik, Pawe

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Almost approximately inner product preserving mappings von Chmieliski, J

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