nonempty constituent

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Boolean algebra (introduction) — Boolean algebra, developed in 1854 by George Boole in his book An Investigation of the Laws of Thought , is a variant of ordinary algebra as taught in high school. Boolean algebra differs from ordinary algebra in three ways: in the values that… … Wikipedia
Theory of relations — This article is about the theory of relations with regard to its specifically combinatorial aspects. For a general discussion of the basic definitions, see Binary relation and Finitary relation. The theory of relations treats the subject matter… … Wikipedia

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