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Thanks for the alert.
Hm, the title of the page is misleading: First, by “basic problems in field X” one usually understands something different. Second, there is nothing specific about algebraic topology here.
Yes, something problematic with this page. What to do with it though? Steenrod here puts extensions at the heart of algebraic topology (and other fields) and treats lifts later.
Is there another title to give to the page?
I just looked at extension which starts with
This entry is about extension of morphisms, dual to lift. For extensions in the sense of “added structure”, such as group extension, Lie algebra extension, infinitesimal extension etc., see at algebra extension.
and then proceeds to talk both about duals to lifts and then extensions of an object by another.
I guess, amusingly, the extension of an object by another object is a lift of the zero map.
Good idea to rename the page, improve its structure, and remove the mention of algebraic topology, thanks! Looks much better now.
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