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pair of spaces
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 . 〔
==References==
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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