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248:" should be merged into this one. The refence it gives is to Hatcher, but he only uses the phrase "pair of spaces" informally. He does not say anywhere that this is the definition of a pair of spaces. Hatcher does talk about CW pairs, and this might be worth added note. I do not know how to merge pages, so I'll leave that for others. ---MCS, Feb 20, 2014.
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Either this page should exist, or in the "Eilenberg
Steenrod axioms" page (as well as others possibly) one must define what a pair (X,A) is. It's not just a pair of spaces in the sense of two objects in the category of spaces. Instead, it is shorthand for a chosen inclusion of A into X. PAIR is a
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I don't know which title is better, so I added a merge tag. In any case, there's a bit more content in this version. --
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I found a reference for the definition of a topological pair. I think this is the correct term and that the page on "
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on 20 August 2018. For the contribution history and old versions of the redirected page, please see
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