Relation binaire
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reason: Introduce notational distinction between restriction and left restriction.
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description: Hubungan antara dua elemen himpunan @in
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title: Binary relation
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description: in der Mengenlehre, eine Menge von 2-Tupeln @de
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text: There is a pleasant symmetry in Wagner's work between heaps, semiheaps, and generalised heaps on the one hand, and groups, semigroups, and generalised groups on the other. Essentially, the various types of semiheaps appear whenever we consider binary relations between different sets and , while the various types of semigroups appear in the case where .
description: tout ensemble de couples ordonnés d'éléments (du même ensemble ou de deux ensembles différents), permettant de définir des relations mathématiques entre eux @fr
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description: підмножина декартового добутку двох множин @uk
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