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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
Feb
19
awarded  Popular Question
Feb
15
awarded  Popular Question
Feb
13
accepted 'Elementary' proof of $\tilde{X}$ is contractible iff $\pi_n(X) =0 \forall n \ge 2$.
Feb
13
revised 'Elementary' proof of $\tilde{X}$ is contractible iff $\pi_n(X) =0 \forall n \ge 2$.
added 25 characters in body
Feb
13
comment 'Elementary' proof of $\tilde{X}$ is contractible iff $\pi_n(X) =0 \forall n \ge 2$.
@KevinCarlson Thank you, I will edit.
Feb
13
revised 'Elementary' proof of $\tilde{X}$ is contractible iff $\pi_n(X) =0 \forall n \ge 2$.
added 51 characters in body
Feb
13
comment 'Elementary' proof of $\tilde{X}$ is contractible iff $\pi_n(X) =0 \forall n \ge 2$.
@NajibIdrissi Yes.
Feb
13
asked 'Elementary' proof of $\tilde{X}$ is contractible iff $\pi_n(X) =0 \forall n \ge 2$.
Jan
28
comment Conservation of bilinear forms and conjugation
@OlivierBégassat Could you clarify what the matrix of a bilinear form is?
Jan
27
accepted Conservation of bilinear forms and conjugation
Jan
27
comment Conservation of bilinear forms and conjugation
@OlivierBégassat Yes.