Mathematics
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cqfd
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All Questions Answers
Score Newest
answer
13
Is there a way to find this limit algebraically? $\lim\limits_{x\to \infty} \frac{x}{\sqrt{x^2 + 1}}$
Jan 5, 2019
answer
12
Prove that $\neg \exists x$ such that $ \lvert x-1\rvert+\lvert x+1 \rvert <1$
Mar 13, 2019
answer
12
An example of open but not closed map.
Dec 5, 2018
answer
10
Show that $\lim\limits_{(x,y)\to(0,0)}\frac{x^3y-xy^3}{x^4+2y^4}$ does not exist.
Feb 13, 2019
answer
9
$x \cdot y$ is an integer and $x - y$ is an integer. Do $x$ and $y$ both have to be integers?
Oct 16, 2019
answer
9
Is weak convergence "limit" unique?
Apr 30, 2020
answer
8
Evaluate $\int \frac{dx}{\left(\frac{1}{x}-\frac{1}{a}\right)}$
May 23, 2019
answer
8
$\int \frac{dx}{\sin x-\cos x}$
Oct 24, 2019
answer
7
Are there any functions that are differentiable but not continuously-differentiable?
Aug 30, 2019
answer
7
If $1, \alpha _1,\ldots,\alpha _{n-1}$ are the roots of $x^n - 1 = 0$, then $n =(1-\alpha_1)(1-\alpha_2)\cdots(1-\alpha_{n-1}).$
Aug 27, 2020

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