Talk:Adjunction space

Untitled
The first example probably was an attempt to show how all CW-complexes are built up, but the description was too vague so I replaced it with a specific example of a CW-complex which is easier to describe for now. - Gauge 05:42, 2 Jun 2005 (UTC)

disjoint union
At the risk of being fussy, I suggest that the symbol for disjoint union operation be changed to $$\sqcup$$ or $$\bigsqcup$$ from the present $$\amalg$$ to be consistent with the article Disjoint union. - Subh83 (talk &#124; contribs) 19:51, 26 April 2011 (UTC)
 * Never mind that. The present notation is the standard for topological spaces. - Subh83 (talk &#124; contribs) 19:55, 26 April 2011 (UTC)
 * Well, I studied quite a bit of topology (years ago) and the symbol confused me - it looks like a damaged upper-case $$\pi$$ with Roman lettering type serifs or $$\prod$$. Perhaps we could link the symbol to the article Disjoint union?  yoyo (talk) 08:34, 16 November 2015 (UTC)

Some history, please
We need more information in the article, for example: yoyo (talk) 10:14, 16 November 2015 (UTC)
 * What's the history of the term "adjunction space"?
 * Who first used it?
 * Who first defined it?
 * Why use "adjunction"?
 * And does it relate to a natural notion of "adjunct" elements in the space?
 * If so, how is the adjunct element defined?