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# closed relation

### См. также в других словарях:

• Relation algebra — is different from relational algebra, a framework developed by Edgar Codd in 1970 for relational databases. In mathematics, a relation algebra is a residuated Boolean algebra supporting an involutary unary operation called converse. The… …   Wikipedia

• Closed and Open Changes — Closed Change and Open Change are basic dance steps in the waltz, performed in closed position. The Closed Change is known as the Box Step in some other dances. Changes also may be Right and Left, making four types of changes in total: Right… …   Wikipedia

• Closed Loop Marketing — fait référence à une boucle de messagerie bidirectionnelle avec les clients. Les messages marketing et les matériaux sont poussés à la clientèle et sont basés sur un aperçu des préférences des clients, et accessibles dans un modèle libre service …   Wikipédia en Français

• Closed system drug transfer device — A closed system drug transfer device is a drug transfer device that mechanically prohibits the transfer of environmental contaminants into a system and the escape of hazardous drug or vapor concentrations outside the system. Contents 1 History 2… …   Wikipedia

• Closed chain — Chain Chain (ch[=a]n), n. [F. cha[^i]ne, fr. L. catena. Cf. {Catenate}.] 1. A series of links or rings, usually of metal, connected, or fitted into one another, used for various purposes, as of support, of restraint, of ornament, of the exertion… …   The Collaborative International Dictionary of English

• Equivalence relation — In mathematics, an equivalence relation is a binary relation between two elements of a set which groups them together as being equivalent in some way. Let a , b , and c be arbitrary elements of some set X . Then a b or a ≡ b denotes that a is… …   Wikipedia

• Recurrence relation — Difference equation redirects here. It is not to be confused with differential equation. In mathematics, a recurrence relation is an equation that recursively defines a sequence, once one or more initial terms are given: each further term of the… …   Wikipedia

• Integer relation algorithm — An integer relation between a set of real numbers x 1, x 2, ..., x n is a set of integers a 1, a 2, ..., a n, not all 0, such that:a 1x 1 + a 2x 2 + cdots + a nx n = 0.,An integer relation algorithm is an algorithm for finding integer relations.… …   Wikipedia

• Existentially closed model — In model theory, a branch of mathematical logic, the notion of an existentially closed model of a theory generalizes the notions of algebraically closed fields (for the theory of fields), real closed fields (for the theory of ordered fields),… …   Wikipedia

• Open and closed systems in social science — Ludwig Bertalanffy describes two types of systems: open systems and closed systems. The open systems are systems that allow interactions between its internal elements and the environment. An open system is defined as a “system in exchange of… …   Wikipedia

• Clausius–Clapeyron relation — The Clausius–Clapeyron relation, named after Rudolf Clausius and Benoît Paul Émile Clapeyron, who defined it sometime after 1834, is a way of characterizing a discontinuous phase transition between two phases of matter. On a pressure–temperature… …   Wikipedia

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