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visits member for 5 years, 2 months
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Just when I thought I was out, they pull me back in


3h
comment What are some correct results discovered with incorrect (or no) proofs?
The previous comment from @S.C. makes no sense to me
3h
reviewed Leave Open The functional $L(\varphi)=\int_0^{2\pi}\frac{\sqrt{1-\varphi^2-(\varphi')^2}}{1-\varphi^2}d\theta$
4h
reviewed Leave Closed Proof the monotonic of a iterated function equation
4h
reviewed Close How plot in logiciel R
4h
reviewed Reject Where is the Erdős–Rado theorem stated in Erdős and Rado's Bull AMS paper?
4h
comment Projective tensor product of the Banach space of discontinuous functions
You do realize that the projective t.p. of C(X) with C(Y) is usually not isomorphic to $C(X\times Y)$? As @EricWofsey says, why would you expect this result to be true?
16h
comment Collaboration or acknowledgment?
There was some discussion of the HL "axiom" #4 at academia.stackexchange.com/questions/5179/… and I think people geting irate here might care to read or contribute to the academia.SE thread
18h
comment Question on viscosity solution through stochastic differential equations
Could you add some more explanation of how this article answers the question?
1d
reviewed No Action Needed The best text to study both incompleteness theorems
1d
comment solve russell paradox
Moreover, MathOverflow is not a place for you to announce your own ideas or ask people to check your ideas. See mathoverflow.net/help/on-topic
1d
comment solve russell paradox
There has been a lot of work on set theory and type theory since Russell formulated his paradox, and so it is unlikely that one will come up with a new approach.
1d
reviewed Looks OK Looking for interesting, natural models of this algebraic theory in which $x^\dagger$ is not always the multiplicative inverse of $x$
2d
comment Does the Diophantine equation $(x^2+ay^2)(u^2+bv^2) = p^2+cq^2$ admit a complete solution?
The original question is asking for a way of producing all of the solutions. Your answer does not explain why your formulas will produce every possible solution
2d
comment Reference request: automorphism of abelian $p$-groups of rank 2
Given the structure theorem for abelian groups, it should not be too hard to count automorphisms by tracking where one sends generators of the cyclic factors of P. This seems to me like it should be a straightforward exercise
2d
comment Reference request: automorphism of abelian $p$-groups of rank 2
Where did you see these results stated? Have you looked in the list of references?
Dec
25
reviewed Close How to calculate the center of a regular polygon?
Dec
25
reviewed Leave Closed Is this a linear space? And if so, what's its dimension?
Dec
25
comment Blood type frequency given probability
Dear caters, this site is geared towards research in mathematics, not research using mathematics
Dec
24
comment How is the shape of $A+R+T$?
@AliTaghavi if you read the literature on K-theory and Ext for Cstar algebras you will see that this is not quite the same as the Yoneda-type Ext that you have defined. Page 1 of the Rosenberg-Schochet article shows this
Dec
24
comment How is the shape of $A+R+T$?
@WillSawin IIRC, the Cstar-algebraists' versions of Ext are not quite the same as the Yoneda-type definition for the category of k-algebras, say.