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In mathematics, more specifically algebraic topology, a pair is shorthand for an inclusion of topological spaces . Sometimes is assumed to be a cofibration. A morphism from to is given by two maps and such that . Heuristically, one often thinks of a pair as being akin to the quotient space . There is a functor from the category of topological spaces to the category of pairs of spaces, which sends a space to the pair .

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  • Paire d'espaces (fr)
  • Topological pair (en)
  • Пара топологических пространств (ru)
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  • En topologie, une paire d'espaces est la donnée d'un espace topologique et d'une partie de celui-ci. Cette structure permet notamment de définir la notion de théorie homologique par des axiomes. (fr)
  • Пара топологических пространств — упорядоченная пара где — топологическое пространство, а — подпространство (с топологией подпространства). Отображение пар определяется как отображение такое, что . Понятие топологической пары удобно для определения относительных гомологий , для которых как раз требуется, чтобы вкладывалось в . Для хороших пространств (например, если — клеточный подкомплекс клеточного комплекса ) выполнено равенство (ru)
  • In mathematics, more specifically algebraic topology, a pair is shorthand for an inclusion of topological spaces . Sometimes is assumed to be a cofibration. A morphism from to is given by two maps and such that . Heuristically, one often thinks of a pair as being akin to the quotient space . There is a functor from the category of topological spaces to the category of pairs of spaces, which sends a space to the pair . (en)
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  • En topologie, une paire d'espaces est la donnée d'un espace topologique et d'une partie de celui-ci. Cette structure permet notamment de définir la notion de théorie homologique par des axiomes. (fr)
  • In mathematics, more specifically algebraic topology, a pair is shorthand for an inclusion of topological spaces . Sometimes is assumed to be a cofibration. A morphism from to is given by two maps and such that . A pair of spaces is an ordered pair (X, A) where X is a topological space and A a subspace (with the subspace topology). The use of pairs of spaces is sometimes more convenient and technically superior to taking a quotient space of X by A. Pairs of spaces occur centrally in relative homology, homology theory and cohomology theory, where chains in are made equivalent to 0, when considered as chains in . Heuristically, one often thinks of a pair as being akin to the quotient space . There is a functor from the category of topological spaces to the category of pairs of spaces, which sends a space to the pair . A related concept is that of a triple (X, A, B), with B ⊂ A ⊂ X. Triples are used in homotopy theory. Often, for a pointed space with basepoint at x0, one writes the triple as (X, A, B, x0), where x0 ∈ B ⊂ A ⊂ X. (en)
  • Пара топологических пространств — упорядоченная пара где — топологическое пространство, а — подпространство (с топологией подпространства). Отображение пар определяется как отображение такое, что . Понятие топологической пары удобно для определения относительных гомологий , для которых как раз требуется, чтобы вкладывалось в . Для хороших пространств (например, если — клеточный подкомплекс клеточного комплекса ) выполнено равенство (ru)
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