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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 --


14h
reviewed Leave Open floating point representation via the perspective of TTE/computable analysis
14h
reviewed Leave Open indecomposable decomposition for a commutative ring
1d
reviewed Close segment intersecting a tetrahedron coordinates
Aug
30
revised Radius of convergence of Taylor expansion of $z \mapsto (1 - z \cdot a)^{-1}$
retagged
Aug
30
revised A question on $p$-approximation property
tweaked formatting to hopefully improve legibility
Aug
30
comment Connection between Haar measure of locally compact group G and Haar measure compact subgroup of it
@hosain It seems that math.stackexchange.com would be a more appropriate place to ask this question (and to get it answered)
Aug
30
reviewed Close Connection between Haar measure of locally compact group G and Haar measure compact subgroup of it
Aug
30
comment Connection between Haar measure of locally compact group G and Haar measure compact subgroup of it
I'm voting to close this question as off-topic because it represents a continuation of a previous question mathoverflow.net/questions/215952 of the OP which is based on a misunderstanding of basic measure theory
Aug
30
comment One question about group algebra
The restriction map is not globally well-defined, as you will see if you take a concrete example such as $G={\bf R}$ and $H={\bf Z}$. Questions at this level would be more suited to math.stackexchange.com
Aug
30
reviewed Leave Open Notation: $Sigma$ and $Pi$ of intersections
Aug
30
comment Lebesgue-integrability of piecewise function with random variable
Your new function is a random variable. So what do you mean for a random function to be Lebesgue integrable? Do you want to know if almost surely the resulting function is Lebesgue integrable?
Aug
30
reviewed Close Intuition for the tensor algebra?
Aug
30
comment Intuition for the tensor algebra?
I'm voting to close this question as off-topic because it consists of one very open-ended question ("tell me about X", which in the old days we might have responded to with the reply "MO is not for requests for people to write a Wikipedia entry for you"), followed by a long string of the OP's own thinking, which does not help to focus the original question
Aug
30
reviewed Close classification open problems by complexity
Aug
30
comment classification open problems by complexity
I'm voting to close this question as off-topic because it is based on a false view of mathematical problems (not least because there is no reason to suppose problems can be linearly ordered in any meaningful way)
Aug
30
reviewed Leave Open Making idempotent element by a relation
Aug
30
comment Making idempotent element by a relation
Would you be happy for someone to reformat the answer using MathJax?
Aug
30
comment One question about group algebra
Let me also point out to the OP, looking at his earlier questions, that in many of them the group structure is not relevant, and that he needs to look up basic results about e.g. $L^p$-spaces in one of the many textbooks that would do this (e.g. Royden or Rudin, off the top of my head)
Aug
30
comment One question about group algebra
However, let me just point out to the OP that in the definition of L^1 spaces, elements of L^1(R^2) are only defined up to sets of measure zero for the usual measure on R^2...
Aug
30
comment One question about group algebra
I'm voting to close this question as off-topic because it arises from some fundamental gaps in knowledge about function spaces and Lebesgue spaces that should be addressed at a level more suited to math.stackexchange.com