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2026_04_14_ackelsberg_richter: Theorem 1.4 of Ackelsberg and Richter (arXiv 2026) characterizes the pairs with d(A) > 0, d(A)+d(B) < 1 and B meeting every residue class for which d(A+B) = d(A)+d(B): lifts of parallel Bohr intervals, or a degenerate case.
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