Abstract
The aim of this paper is to solve the orthogonality equation with two unknown functions. This problem was posed by J. Chmieliński during two international conferences.
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Chmieliński, J.: Orthogonality equation with two unknown functions. Aequationes Math., to appear; doi:10.1007/s00010-015-0359-x
Chmieliński, J., Łukasik, R., Wójcik, P.: On the stability of the orthogonality equation and orthogonality preserving property with two unknown functions (submitted)
Report of Meeting, Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, Vol. 12, pp. 91–131 (2013)
Report of Meeting, Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, Vol. 13, pp. 139–169 (2014)
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Łukasik, R., Wójcik, P. Decomposition of two functions in the orthogonality equation. Aequat. Math. 90, 495–499 (2016). https://doi.org/10.1007/s00010-015-0385-8
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DOI: https://doi.org/10.1007/s00010-015-0385-8