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On an Orthogonality Equation in Normed Spaces |
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| Authors: | P. Wójcik |
| Affiliation: | 1.Institute of Mathematics,Pedagogical University of Cracow,Kraków,Poland |
| Abstract: | The aim of this paper is to give an answer to the question, posed by Alsina, Sikorska, and Tomás, as to whether each norm derivative preserving mapping is necessarily linear. |
| Keywords: | |
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