Timeline for Can a phantom map have finite cofiber?
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
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| Feb 13 at 3:13 | comment | added | kiran | I was thinking: filter X as a colimit of finite spectra X_n such that the first stage is F. Then all other stages have their identity map factoring through F so theyre summands of F, so X is also. | |
| Feb 12 at 17:33 | comment | added | Tim Campion | @kiran I like that argument -- if you see how to complete it, I'd be interested! | |
| Feb 12 at 15:52 | comment | added | kiran | You could also argue via the fiber, which would be a finite F-->X through which all maps finite-->X factor. I think that forces X to be finite already? | |
| Feb 11 at 4:55 | vote | accept | Tim Campion | ||
| Feb 6 at 23:59 | history | answered | Tim Campion | CC BY-SA 4.0 |