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May
25
answered What is the formal definition of $d$, or $\partial$, in differation and integration
May
25
comment Simple (even toy) examples for uses of Ordinals?
This sucks. I didn't know that $1+\omega$ was $\omega$. What's the purpose of such a noncommutative "addition"?
May
25
revised Two introductory linear algebra problems
added 133 characters in body; added 86 characters in body
May
25
revised Two introductory linear algebra problems
added 493 characters in body
May
25
revised Two introductory linear algebra problems
added 141 characters in body; deleted 141 characters in body
May
25
revised Two introductory linear algebra problems
added 234 characters in body
May
25
answered Two introductory linear algebra problems
May
25
revised find skew lines on a cubic surface for a parametrization
added 168 characters in body
May
25
answered find skew lines on a cubic surface for a parametrization
May
24
comment How to understand and appreciate the prime number industry?
Lowest prime whose factors are not obvious? I thought that the factors of any prime $p$ are obvious, namely $1$ and $p$. ;-)
May
24
comment Fibration $v:S^1 \to \mathbb{R}P^1$ and a nontrivial element of $\pi_1(\mathbb{R}P^n,\ast)$
Unless there's some formal catch, I agree with @user8268. The circle $S^1$ is wrapped "twice" - from a point to the opposite point of the higher-dimensional sphere and back. This is a trivial path/submanifold both in homotopy and homology, isn't it? That's twice of the generator of the $Z_2$ group.
May
24
comment Linear Algebra Question
It was a pleasure, @MAxcoder. Thanks for your bounty. ;-)
May
24
comment AES Key Scheduler
Hi, look at en.wikipedia.org/wiki/Rijndael_key_schedule#Rcon
May
24
answered Simple (even toy) examples for uses of Ordinals?
May
24
comment Function growth comparison
Compare the $n$th root of these two functions. For the left one, it goes to $10/8$ because the difference between $n$, $n-2$, and $n+3$ becomes negligible when taking the roots, and for the right one, it goes to $\log(n)^5$. The latter is ultimately greater than $10/8$, so its $n$th power is also larger.
May
24
answered relations between root lattice and weight lattice
May
24
revised Finding Lagrange's form of the remainder with $a = \pi/2$ and $n\to\infty$
Dollar signs added around maths, nothing else
May
24
suggested approved edit on Finding Lagrange's form of the remainder with $a = \pi/2$ and $n\to\infty$
May
24
revised A question about integral quadratic forms
Math put in dollar signs, no other edits
May
24
suggested approved edit on A question about integral quadratic forms