Mathematics
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Scientifica
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All Questions Answers
Score Newest
answer
20
What is $\frac{1}{|{x}|}-\frac{x^2}{|x|^3}$?
Nov 23, 2018
answer
12
Evaluating $\int\frac{\sqrt{x^2-1}}x\mathrm dx$
Jan 14, 2015
answer
11
A subbasis $S$ for a topology on $X$ is a collection of subsets of $X$ whose union equals $X$.
Aug 19, 2018
answer
11
If $\sum a_n$ converges and $(b_n)$ converges, then does $\sum a_nb_n$ converge?
Oct 2, 2017
question
11
Every subspace of the dual of a finite-dimensional vector space is an annihilator
Aug 2, 2016
answer
9
Let $a,b \in$ group $G$ such that $ab=ba, \gcd(O(a),O(b))=1$. Prove that $O(ab)=O(a)O(b)$.
Jul 14, 2015
question
8
Why is it true that $|AB:A|=|B:A\cap B|$ even if $A$ is not normal in $AB$? (Second Isomorphism Theorem)
Jul 13, 2015
answer
7
What is wrong with this fake proof that any subset of a $T_1$ space is closed?
Apr 6, 2020
question
7
Normalizer of a Sylow 2-subgroups of dihedral groups
Aug 26, 2015
answer
7
What is Direct Sum Decomposition
Feb 17, 2015

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