Abstract
We solve a problem posed by Szostok (Aequat Math 73:172–200, 2007).
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Balcerowski, M. On a problem of T. Szostok on functions with monotonic differences. Aequat. Math. 85, 165–167 (2013). https://doi.org/10.1007/s00010-012-0145-y
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DOI: https://doi.org/10.1007/s00010-012-0145-y