Timeline for Is an open subset of a cofibration a cofibration?
Current License: CC BY-SA 4.0
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| Feb 15, 2021 at 19:26 | comment | added | Tyrone | It seems that what's needed for the existence of $\tau$ is a suitably strong sense of perfect normality, and, eg, exists whenever $X$ is a CW complex (metrisable or not). | |
| Feb 14, 2021 at 21:00 | history | answered | John Rognes | CC BY-SA 4.0 |