Problem 1120: Radial obstructions and degree transfer

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radial_obstruction_transfer: Compactness turns the absence of an allowed radius into shortest escape length greater than one; powers preserve that obstruction only at degree multiples.

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The [[research/erdos_1120/radial_obstruction_transfer|argument on radial obstructions and degree transfer]] records its exact scope, source premises, and remaining gap toward Problem 1120.