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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!
Mar
20
comment Why is $\ker\omega$ integrable iff $\omega\wedge d\omega=0$?
Yes, with $c=1$.
Mar
20
revised Why is $\ker\omega$ integrable iff $\omega\wedge d\omega=0$?
added 4 characters in body
Mar
20
answered Why is $\ker\omega$ integrable iff $\omega\wedge d\omega=0$?
Mar
20
comment Showing when a permutation matrix is diagonizable over $\mathbb R$ and over $\mathbb C$
@PatrickDaSilva Thank you : )
Mar
20
answered Proof of Proposition 2.4 in Atiyah-MacDonald
Mar
20
reviewed Leave Open The expected value of $1/(1+X)$ where $X$ has geometric distribution
Mar
20
reviewed Leave Open $f(x)$ is non-negative and that $ \int_{-a}^b xf(x) dx = 0 $. Show $ \int_{-a}^bx^2f(x)dx \leq ab\int_{-a}^b f(x)dx $