= Uriel Frisch
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<Uriel Frisch> studied nonuniform scaling of invariant measures with <Konstantin Khanin> and <Takeshi Matsumoto>. Their work on the <Feigenbaum attractor> related the statistics of <fractional derivatives> to the local singularity structure of a <multifractal measure>.<Multifractality of the Feigenbaum attractor and fractional derivatives by Uriel Frisch and others>[Abstract: derivative tails, singularity spectrum and numerical tests]{ref}
A single fractal dimension need not describe how probability concentrates differently from point to point. The derivative-based test offers another way to probe that spatially varying scaling, with the paper explicitly comparing heuristic arguments and precise numerical calculations.
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