Vol. 37(51), pp. 2324 (1985) 

An application of nonstandard analysis to functional equationsMiodrag Ra\v skovi\'cPrirodnomatemati\v cki fakultet, Kragujevac, YugoslaviaAbstract: Using methods of nonstandard analysis it is proved that all measurable solutions of the equation $f(x+y)=g(f(x),\, f(y),\,\, x, y)$ (with $g$ continuous) are continuous. Classification (MSC2000): 03H05; 39B99 Full text of the article:
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