Abstract
We present some observations on hyperstability for the Jensen equation on restricted domain. Namely, we show, under some weak natural assumptions, that functions satisfying the equation approximately (in some sense) must be actually solutions to it.
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Bahyrycz, A., Piszczek, M. Hyperstability of the Jensen functional equation. Acta Math Hung 142, 353–365 (2014). https://doi.org/10.1007/s10474-013-0347-3
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DOI: https://doi.org/10.1007/s10474-013-0347-3