Mathematics
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jrs
  • Member for 7 years, 7 months
  • Last seen more than 1 year ago
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17
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All Questions Answers
Score Newest
question
12
Let $f \in \Bbb Z[x]$ such that there exist distinct $a$, $b$, $c$ and $f(a)=f(b)=f(c)=1$. Prove that there is no $d \in \Bbb Z$ such that $f(d)=0$
Apr 23, 2017
question
12
Prove that $2^n$ does not divide $n!$
Jun 1, 2016
question
6
How to find the closed formula for $\sum _{i=0}^n {i q^i}$?
Sep 19, 2016
question
5
Use Cauchy's Theorem to find $\lim_{(x,y)\to(0,0)} \frac{\cos(x) - \cos(y)}{x^2 - y^2}$.
May 30, 2017
question
5
Prove that for $k>1$ $a_n$ is a perfect square
May 1, 2016
question
4
Prove existence of $\lim_{(x,y) \rightarrow (0,2)} \frac{x (y-2)^3}{3x - 5(y-2)^4}$
Jul 14, 2017
question
4
Find general formula for $\sum _{i=1}^{n} \frac {(-1)^i i}{(2i-1)(2i+1)}$
Apr 25, 2016
question
4
Prove that if $p \mid a-b$ then $p^{n+1} \mid a^{p^n}-b^{p^n}$
May 25, 2016
question
3
Trying to see if $f(x,y)=xy+1-\sin\left (\frac{x^2}{2}\right)$ is differentiable at $(1,5)$
Jun 1, 2017
answer
3
How to prove that $\lim_{(x,y)\to(0,0)} \frac{\sin(xy)}{|x-y|}$ does not exist?
May 25, 2017

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