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Oct
17
reviewed Reject suggested edit on Estimating the number of clusters
Oct
5
reviewed Approve suggested edit on Group scheme counterexample
Oct
5
reviewed Approve suggested edit on Heuristic probabilistic argument for the Navier-Stokes existence and smoothness conjecture
Oct
5
reviewed Approve suggested edit on Scalar Measure Associated to a Positive Operator Valued Measure
Oct
4
comment A natural center of a convex weakly compact set in Banach space
Really cute! Of course this is nothing like the centroid, even in $\mathbb{R}^n$, for the reason pointed out in my second answer.
Oct
3
awarded  Nice Answer
Oct
3
reviewed Reject suggested edit on Simple functions on a product measure space
Oct
1
reviewed Approve suggested edit on eigenvalues of a Möbius strip
Sep
29
comment Relative Compactness vs Way Below in Locally Compact Hausdorff Spaces
Actually, on thinking it over I feel your counterexample is more interesting than either of my answers ...
Sep
29
comment Relative Compactness vs Way Below in Locally Compact Hausdorff Spaces
You're welcome, and thank you for pointing out my mistake.
Sep
29
revised Relative Compactness vs Way Below in Locally Compact Hausdorff Spaces
added 13 characters in body
Sep
29
revised Relative Compactness vs Way Below in Locally Compact Hausdorff Spaces
added 439 characters in body
Sep
27
comment Relative Compactness vs Way Below in Locally Compact Hausdorff Spaces
If $\overline{Y}$ is compact then any net in $Y$ has a cluster point in $\overline{Y} \subseteq X$. If it is not compact, find a family of open subsets of $X$ which covers $\overline{Y}$ but has no finite subcover, include $X\setminus\overline{Y}$ to get an open cover of $X$, and contradict (2).
Sep
26
comment Relative Compactness vs Way Below in Locally Compact Hausdorff Spaces
Tristan, these exercises are left to the reader!
Sep
26
answered Relative Compactness vs Way Below in Locally Compact Hausdorff Spaces
Sep
26
comment Relative Compactness vs Way Below in Locally Compact Hausdorff Spaces
@Johannes: no, take $Y = (0,1)$ and $X = \mathbb{R}$.
Sep
19
answered The set of matrices with same spectral radius
Sep
16
comment For what nonnegative measures $\mu$ does $\mu*e^{-|\cdot|}\in L^{\infty}$?
Voting to close until we get some idea of what the question means by "boundedness".
Sep
16
reviewed Approve suggested edit on discrete-morse-theory tag wiki
Sep
16
reviewed Approve suggested edit on discrete-morse-theory tag wiki excerpt