Timeline for Are there any "homotopical spaces"?
Current License: CC BY-SA 3.0
11 events
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| S Mar 26, 2016 at 18:18 | history | suggested | Silvia Ghinassi | CC BY-SA 3.0 |
Fixed mathjax
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| Mar 26, 2016 at 17:58 | review | Suggested edits | |||
| S Mar 26, 2016 at 18:18 | |||||
| Apr 18, 2010 at 19:39 | comment | added | Qfwfq | @Q.Y.: I think that when you ask "is $\mathcal{C}$ concrete?" you make a harmless abuse of language similar to the one you would commit asking "is the Banach space $X$ even a Hilbert space?". Every mathematician would understand it as "does $X$ admit a scalar product inducing the norm blah blah blah?" | |
| Apr 18, 2010 at 4:34 | comment | added | Qiaochu Yuan | My understanding is that it is preferable to say "concretizable" rather than "a concrete category": one should always think of a concrete category as a category equipped with a distinguished forgetful functor to Set, since the same category can be concretized in different ways. | |
| Apr 18, 2010 at 4:10 | history | edited | Qfwfq | CC BY-SA 2.5 |
added 5 characters in body
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| Apr 18, 2010 at 4:03 | history | edited | Qfwfq | CC BY-SA 2.5 |
added 173 characters in body; added 111 characters in body
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| Apr 18, 2010 at 4:01 | comment | added | Qfwfq | Well, in the light of the article linked by QiaochuYuan, I'd say it definitely is a question: "is the homotopy category of topological spaces a concrete category?". Perhaps I should edit to make it clear. | |
| Apr 17, 2010 at 16:08 | comment | added | Qfwfq | Just out of curiosity: did the guy who voted to close the question regarded it as "no longer relevant" or as "offtopic"? | |
| Apr 17, 2010 at 15:35 | vote | accept | Qfwfq | ||
| Apr 17, 2010 at 15:30 | answer | added | Qiaochu Yuan | timeline score: 59 | |
| Apr 17, 2010 at 15:00 | history | asked | Qfwfq | CC BY-SA 2.5 |