On a problem of Matkowski
We solve Matkowski's problem for strictly comparable quasi-arithmetic means.
Remarks on the comparison of weighted quasi-arithmetic means
We present comparison theorems for the weighted quasi-arithmetic means and for weighted Bajraktarević means without supposing in advance that the weights are the same.
A Functional Equation with Differences
Quasi-sums in several variables.
Hyperstability of a class of linear functional equations.
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