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Mar
26
reviewed Close Finding the volume of a solid of revolution
Mar
26
comment Does $\sin(n)$ hit all real numbers between $-1$ and $1$ if $n$ is an integer?
@DanielEscudero It's equivalent to the irrationality of $\pi$.
Mar
25
revised Every nilpotent left ideal is contained in a nilpotent 2 sided ideal.
added 1 character in body
Mar
25
comment Every nilpotent left ideal is contained in a nilpotent 2 sided ideal.
@user225311 yes, fixed it.
Mar
24
comment $\int_{\mathbb R}|f(x)|^{2} dx <\infty \implies \sum_{m\in \mathbb Z}\int_{m-\beta}^{m+\beta}|f(x)|^{2} dx <\infty$?
Yes, because you will cover every point in $\Bbb R$ a set amount of times, smaller than some constant that is roughly equal to $2\beta$ I would guess. The total sum should be smaller than $k\int|f|^2$ for some integer $k$ of the order of $2\beta$.
Mar
23
comment The closed unit ball is not compact in infinite dimension spaces. Why?
Their distance in the sup norm is $1$.
Mar
23
comment Reducibility of $P(X^2)$
So it turns out that one can recast a vote if the answer has been edited recently, which is why I added an invisible string of characters at the end of yours, and was finally able to undo my erroneous downvote.
Mar
23
revised Reducibility of $P(X^2)$
I added an invisible string of characters at the end of your answer, this allows me to change my initial mistaken downvote into an upvote.
Mar
23
revised Where did mathematicians learn how to do truth tables?
I added an invisible string of characters at the end so that I may undo an erroneous downvote.
Mar
22
reviewed Close What function would do this
Mar
22
reviewed Close Mathematical Background for Computer Vision
Mar
22
reviewed Leave Open The Weaver Android app $\rightarrow$ cute combinatorics problem
Mar
22
reviewed Leave Open What is the best way for an amateur Mathematician to get their paper reviewed?
Mar
22
comment Can every (Hausdorf) topological space be homeomorphically embedded in a topological vector space?
@MattSamuel He's talking about embeddings, continuous injections that induce a homeomorphism onto their image.
Mar
22
answered Normal Subgroups of $SU(n)$
Mar
21
comment Matrix can be orthogonally diagonalized iff its eigenvectors are linearly independent
There is a mistake. It should read "a matrix can be diagonalized if and only if there is a basis of eigenvectors. In the second part of the proof, we see that a symmetric matrix has the special property that all of its eigenvectors are orthogonal." Which solves the problem.
Mar
21
comment Matrix can be orthogonally diagonalized iff its eigenvectors are linearly independent
No, 4) is the well known spectral theorem (see en.wikipedia.org/wiki/Spectral_theorem).
Mar
21
answered Every nilpotent left ideal is contained in a nilpotent 2 sided ideal.
Mar
21
reviewed Close What are the properties of the positive real numbers pair $(a,b)$ for which $a b \geq a + b$?
Mar
20
comment Proof of Proposition 2.4 in Atiyah-MacDonald
@user26857 Cool :D, that's nice!