Alyosha
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 Mar 20 answered Is $\frac{\partial x}{\partial y}=\frac{\partial x}{\partial z}\frac{\partial z}{\partial y}$? Mar 20 comment Simple proof verification What does $\Gamma_i$ mean? Mar 15 comment Badly behaved, but easy-to-manipulate examples of rings to test hypotheses on @N.H. Oh, thanks! Maybe you could answer with an example if you have the time? Mar 15 asked Badly behaved, but easy-to-manipulate examples of rings to test hypotheses on Mar 14 revised If $S_\epsilon$ is dense for all $\epsilon$, is $S_0$ dense? deleted 55 characters in body Mar 13 revised If $S_\epsilon$ is dense for all $\epsilon$, is $S_0$ dense? added 4 characters in body Mar 12 comment 'Elementary' proof of $\tilde{X}$ is contractible iff $\pi_n(X) =0 \forall n \ge 2$. Sorry, why does it follow that $\pi_1(X)= \pi_1(\tilde{X})$ for $n \ge 2$? Mar 10 revised Is the pushforward measure a categorical-theoretic pushout? added 6 characters in body Mar 10 comment If $S_\epsilon$ is dense for all $\epsilon$, is $S_0$ dense? The italics are directed not at anyone who has already answered, but at potential answerers. Mar 10 revised If $S_\epsilon$ is dense for all $\epsilon$, is $S_0$ dense? added 49 characters in body Mar 9 revised If $S_\epsilon$ is dense for all $\epsilon$, is $S_0$ dense? added 52 characters in body Mar 9 revised If $S_\epsilon$ is dense for all $\epsilon$, is $S_0$ dense? [Edit removed during grace period] Mar 9 comment Discriminant is the unique invariant of $\text{SL}_2\mathbb{Z}$ acting on polynomials. Leox, this answer is actively detrimental to my attempts to understand this, in that having an answer reduces answerer-traffic, and this answer is basically a rephrasing of the question with the addition of 'some theorem proves it'. Please either delete this or at least provide a link to the proof of that result (I can't find a proof by googling). Thank you. Mar 9 comment If $S_\epsilon$ is dense for all $\epsilon$, is $S_0$ dense? Baire, measures or whatever are fine to use, this isn't a homework, but I doubt they will be that useful here, even if it feels a little Bairey. Mar 9 asked If $S_\epsilon$ is dense for all $\epsilon$, is $S_0$ dense? Mar 7 comment Is the pushforward measure a categorical-theoretic pushout? @tomasz I just guessed about it being a pushout, what I really wanted to know was whether it is universal in some category. Could you consider fleshing out your description of how pushforward maps are universal into an answer? Mar 6 asked Is the pushforward measure a categorical-theoretic pushout? Mar 5 revised Discriminant is the unique invariant of $\text{SL}_2\mathbb{Z}$ acting on polynomials. added 88 characters in body Mar 5 asked Discriminant is the unique invariant of $\text{SL}_2\mathbb{Z}$ acting on polynomials. Feb 26 awarded Popular Question