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"If he had been a great and wise philosopher... he would now have comprehended that Work consists of whatever a body is obliged to do, and that Play consists of whatever a body is not obliged to do. And this would help him to understand why constructing artificial flowers or performing on a treadmill is work, while rolling tenpins or climbing Mont Blanc is only amusement."
 from The Adventures of Tom Sawyer by Mark Twain 
17h

comment 
What is the idea behind a projection operator?what does it do?
Wikipedia seems useful here 
19h

reviewed  Reopen embedding dimension of normal surface singularity 
1d

comment 
graph edge partitioning for isomorphism testing
What exactly is the question here? 
1d

comment 
Hadamard Product and Eigendecomposition
What data are allowed to appear in your "closedform expression"? Of course we need to know the eigendecomposition of $B$... 
2d

comment 
What are applications of commutativity theorems for rings?
Would you be satisfied, or at least placated, by uses of the contrapositive? (Not that I can think of any right now, so this is purely hypothetical.) 
May 26 
reviewed  Close TVS with null topological dual space 
May 26 
reviewed  Close positiv Martingale using Itô 
May 25 
reviewed  Leave Closed How to find the odds for events (two or more) using its probability 
May 24 
reviewed  Reject How to understand a solenoid? 
May 24 
reviewed  Leave Closed Determine if you can build a polygon from segments 
May 24 
comment 
Determine if you can build a polygon from segments
@spemble answer, not explore 
May 23 
comment 
Could RH be a consequence of some kind of central limit theorem?
I'm voting to close this question as offtopic because it seems like baseless speculation 
May 22 
comment 
Schatten $p$classes for small $p$
See my comment above: $T$ is assumed to be selfadjoint 
May 22 
comment 
Schatten $p$classes for small $p$
@ChristianRemling I've just noticed that the OP is restricting attention to the case where $T$ is selfadjoint, so I think you would need a bit more work to get a counterexample than in your comment 
May 22 
comment 
compute standard basis in local rings
This is phrased like an exercise from a text. If not, could you please give some further explanation of where this problem arises, which special cases you've been able to do, and so on? 
May 22 
revised 
Maximum entropy to fit Johnson distribution by moments
replaced a tag 
May 20 
comment 
Will this be a case of self plagiarism or will it annoy the referee?
@TheMaskedAvenger +10 for the last sentence 
May 18 
comment 
Do quotients of amenable groups C*algebras satisfy the UCT?
Did you ever find an answer to this question? 
May 18 
comment 
Symmetric and antisymmetric powers of SU(2) representations
I'm voting to close this question because Qiaochu promises to answer it elsewhere :) 
May 18 
comment 
Powers of compact operators
In your setting, diagonalize, and then try to prove every diagonal matrix with c_0 entries is compact. 