Reputation
66,006
Next tag badge:
94/100 score
31/20 answers
Badges
5 74 167
Newest
 ring-theory
Impact
~666k people reached

6h
comment Which is the best method/algorithm to predict rank in an exam based on historical data?
Probably "best" is impossible to define, but if you assume a certain amount of uniformity of students and exams over time, you might be able to create something good enough.
6h
revised Let $f,g$ be continuous from $\mathbb R$ to $\mathbb R$
added 3 characters in body
6h
comment If $\lim_{|z|\to \infty}\frac{f(z)}{g(z)}$ exists then either $f\equiv0$ on $\Bbb C$ or $f(z)\not =0$ for all $z\in \mathbb C$.
@S.Panja-1729 Yes, it does, actually. It is bounded for $|z|>N$ for some $N$, and it is bounded in the compact set $|z|\leq N$.
6h
revised Let $f,g$ be continuous from $\mathbb R$ to $\mathbb R$
Grammar, punctuation
6h
answered Let $f,g$ be continuous from $\mathbb R$ to $\mathbb R$
6h
revised Let $f,g$ be continuous from $\mathbb R$ to $\mathbb R$
added 33 characters in body; edited title
7h
comment Are there some theories that explain the connections between differential equations and cellular automaton?
My feeling is that this question is unmotivated by anything. I didn't downvote, but the question is both vague and unmotivated.
7h
comment Proving that a doubly-periodic entire function $f$ is constant.
As for why you need analytic, you can again take $\omega_1=1,\omega_2=i$ and define $f(a+bi)=\cos(2\pi a) + i\sin(2\pi b)$, which has the required property (but is not analytic.)
7h
comment Proving that a doubly-periodic entire function $f$ is constant.
(We call these 'doubly-period' functions.)
7h
revised Proving that a doubly-periodic entire function $f$ is constant.
edited title
7h
comment Proving that a doubly-periodic entire function $f$ is constant.
That intuition is not correct. It is more complicated than that. For example, think of $\omega_1=1,\omega_2=i$. Then all you have is that if $z_1,z_2$ differ by a Gaussian integer, then $f(z_1)=f(z_2)$. There is no elementary geometric intuition for this.
7h
comment Thinking Process: a set is closed if it contains all of its limit points (--> this direction)
And what definition of "closed" are you using? Because your proposition is the definition of closed in some books.
8h
awarded  ring-theory
8h
revised How to prove $ \sum\limits_{k=1}^{n}\frac{k}{(k+1)!}=1-\frac{1}{(n+1)!}$ using induction?
edited title
8h
revised How to prove $ \sum\limits_{k=1}^{n}\frac{k}{(k+1)!}=1-\frac{1}{(n+1)!}$ using induction?
added 21 characters in body
13h
comment If each term in a sum converges, does the infinite sum converge too?
It is tricky, because the $s_n(x)$ are not defined for all $x\in\mathbb R$, so you have to be careful about saying $s_n(x)\to 0$ as $x\to\infty$.
23h
answered Lambda Calculus: Prove $m \ Succ\ n = m+n$
23h
revised How to find $\left|\operatorname{Aut}(\mathbb Z_2\times\mathbb Z_2)\right|$
added 33 characters in body; edited title
23h
comment Is it true that if $g,h\in G$ have order $p$, where $p$ is prime, the only possible order of $\langle g\rangle \cap \langle h \rangle$ is $p$?
Well, it could be $1$.
23h
comment Lambda Calculus: Prove $m \ Succ\ n = m+n$
Shouldn't that be $m=\lambda fx.f^{m}(x)$? You have $n=$ with $m$.