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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 tread-mill is work, while rolling ten-pins 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 "closed-form 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 off-topic because it seems like baseless speculation
May
22
comment Schatten $p$-classes for small $p$
See my comment above: $T$ is assumed to be self-adjoint
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 self-adjoint, 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.