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On a ρ-orthogonality

Aequationes Mathematicae (2010) 80(1) 45-55
DOI: 10.1007/s00010-010-0042-1
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Abstract

In a normed space we introduce an exact and approximate orthogonality relation connected with "norm derivatives". We also consider classes of linear mappings preserving (exactly and approximately) this kind of orthogonality. © 2010 The Author(s).

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Chmieliński, J., & Wójcik, P. (2010). On a ρ-orthogonality. Aequationes Mathematicae, 80(1), 45–55. https://doi.org/10.1007/s00010-010-0042-1

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