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The Non-Cancelling Intersections Conjecture

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arxiv 2401.16210 v1 pith:UFNB2WI3 submitted 2024-01-29 math.CO cs.DM

The Non-Cancelling Intersections Conjecture

classification math.CO cs.DM
keywords conjectureintersectionsunionexpressmeasuretermsbooleancomplement
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In this note, we present a conjecture on intersections of set families, and a rephrasing of the conjecture in terms of principal downsets of Boolean lattices. The conjecture informally states that, whenever we can express the measure of a union of sets in terms of the measure of some of their intersections using the inclusion-exclusion formula, then we can express the union as a set from these same intersections via the set operations of disjoint union and subset complement. We also present a partial result towards establishing the conjecture.

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Cited by 1 Pith paper

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    Probabilistic membership for context-free languages is in PTIME for unambiguous and poly-slicewise-unambiguous languages, #P-hard for some unions of two linear unambiguous CFLs, and tractable via complement-capable ci...