| 翻訳と辞書 | Pair of spaces| Pair of spaces  : ウィキペディア英語版 | 
 In mathematics, particularly algebraic topology, a pair of spaces is an ordered pair  where  is a topological space and  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  by . Pairs of spaces occur centrally in relative homology.
 A related concept is that of a triple , with . Triples are used in homotopy theory. Often, for a pointed space with basepoint at , one writes the triple as , where . 〔
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 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』
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