Problem 120: A superlacunary test for similarity criteria

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superlacunary_route_obstructions: The sequence 2 to the minus 2 to the j escapes ratio, sumset, and Fourier-decaying-measure hypotheses; these are method obstructions, not a similarity counterexample.

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The [[research/erdos_120/superlacunary_route_obstructions|argument on a superlacunary test for similarity criteria]] records its exact scope, source premises, and remaining gap toward [[problems/analysis/E0120/_index|Problem 120]].