Talk:Cone (topology)

Latest comment: 2 years ago by 164.15.244.37 in topic Notation "lim"

This article makes the standard mistake about cones; it assumes that the cone is defined via the quotient topology and then it pretends that the homotopy

ht(x,s) = (x, (1−t)s).

is obviously continuous. Thus cones are obviously contractible to their apex. I don't know a treatment that makes this transparently obvious... Here is one discussion: [1]. Sam nead (talk) 15:58, 28 December 2017 (UTC)Reply

Notation "lim"

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Is the notation   meant to suggest that the cone is the pushout of the indicated span? If so, please write it explicitly. 164.15.244.37 (talk) 07:43, 25 February 2022 (UTC)Reply