R. Y. Osaulenko
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Methods Funct. Anal. Topology 26 (2020), no. 2, 179-188
We study an analogue of the logarithmic $(u,v)$-derivative. The last one has many interesting properties and good ways to calculate it. To show how it can be used we apply it to a model class of nowhere monotone functions that are composition of Salem function and nowhere differentiable functions.