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Apr 13, 2017 at 12:19 history edited CommunityBot
replaced http://math.stackexchange.com/ with https://math.stackexchange.com/
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
Sep 21, 2014 at 12:26 history edited Fedor Petrov CC BY-SA 3.0
proof appeared in the answers is added
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
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