Timeline for If any open set is a countable union of balls, does it imply separability?
Current License: CC BY-SA 3.0
15 events
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Apr 13, 2017 at 12:19 | history | edited | CommunityBot |
replaced http://math.stackexchange.com/ with https://math.stackexchange.com/
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Sep 21, 2014 at 22:43 | comment | added | user9072 | You can actually comment-notify editors if you want by adding the @ as ususal. | |
Sep 21, 2014 at 12:34 | history | edited | Fedor Petrov | CC BY-SA 3.0 |
added 182 characters in body
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Sep 21, 2014 at 12:26 | history | edited | Fedor Petrov | CC BY-SA 3.0 |
proof appeared in the answers is added
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Sep 21, 2014 at 11:45 | vote | accept | Fedor Petrov | ||
Sep 19, 2014 at 5:28 | comment | added | Fedor Petrov | Andres, comments below suggest that my initial tag set-theory was quite reasonable) | |
Sep 19, 2014 at 5:20 | history | edited | Andrés E. Caicedo |
edited tags
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Sep 19, 2014 at 2:37 | answer | added | Ashutosh | timeline score: 37 | |
Sep 19, 2014 at 1:37 | answer | added | Timothy Chow | timeline score: 3 | |
Sep 19, 2014 at 0:39 | comment | added | The Masked Avenger | Are there any clear connections between this question and the Baire Category theorem? | |
Sep 18, 2014 at 19:41 | answer | added | Joel David Hamkins | timeline score: 43 | |
Sep 18, 2014 at 19:41 | comment | added | Fedor Petrov | If we allow exterior centers, the answer becomes obviously no: take arbitrary X, all distances are equal to 1, then for any subset Z of X choose a new point y(Z) with distances 1 to Z and 2 to all other points. | |
Sep 18, 2014 at 19:29 | comment | added | Włodzimierz Holsztyński | One could also consider a closely related question, namely a metric space $\ (Y\ d),\ $ and $\ X\subseteq Y$, and traces of balls $\ B(y\ r)\cap X$ for $\ y\in Y\ $ (instead of simply $\ X\ $ and balls in $\ X\ $). | |
Sep 18, 2014 at 19:19 | comment | added | Włodzimierz Holsztyński | A surprising cute question. Perhaps it's more than just cute. | |
Sep 18, 2014 at 18:31 | history | asked | Fedor Petrov | CC BY-SA 3.0 |