Abstract
We introduce the concept of approximate Roberts orthogonality set and investigate the geometric properties of such sets. In addition, we introduce the notion of approximate a-isosceles-orthogonality and consider a class of mappings, which approximately preserve a-isosceles-orthogonality.
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Zamani, A., Moslehian, M.S. Approximate Roberts orthogonality sets and \({(\delta, \varepsilon)}\)-(a, b)-isosceles-orthogonality preserving mappings. Aequat. Math. 90, 647–659 (2016). https://doi.org/10.1007/s00010-015-0383-x
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DOI: https://doi.org/10.1007/s00010-015-0383-x