Abstract
The orthogonality equation involving two unknown functions
and, among related problems, the orthogonality preserving property
are considered.
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Dedicated to Professor Roman Ger on his 70th birthday
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Chmieliński, J. Orthogonality equation with two unknown functions. Aequat. Math. 90, 11–23 (2016). https://doi.org/10.1007/s00010-015-0359-x
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DOI: https://doi.org/10.1007/s00010-015-0359-x