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Mathematics
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Marcos
  • Member for 3 years, 3 months
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answer
8
For what $k$, are the roots of $p(x) = 4x^2 -2x +k=0$ in $(-1,1)$?
May 8, 2023
question
8
Compute the cohomology ring of $G=\langle u,v\mid uvuv=vuvu\rangle$.
May 13
question
6
Prove that $\lim_{n\to\infty}\|f_n-f\|_p=\lim_{n\to\infty}\|g_n-g\|_p=0$
Dec 21, 2021
question
6
$(\int_{\mathbb{R}}|\int_\mathbb{R}{\mathcal{F}^{-1}}(\chi_{(t,\infty)}\hat{f})(\xi)m'(t)dt|^pd\xi)^{1/p}\leq C_p\|m'\|_{L^1}\|f\|_{L^p}$
Mar 21, 2022
question
6
Proof of a weighted norm inequality.
Mar 19, 2022
question
5
Let $G$ be a finite group, $H$, $K$ be normal subgroups and $P$ a sylow p-subgroup . Then $PH \cap PK=P\left( H\cap K\right)$.
Aug 27, 2021
question
5
Every ring $R$ has a minimal prime ideal.
Sep 12, 2021
question
5
If $G\to\mathbb{Z}$ and $H\to\mathbb{Z}$ are surjective homomorphisms prove that exists $G\times H\to\mathbb{Z}$ with finitely generated kernel.
Jan 25
question
5
Find the presentation for the kernel of a map from $G=\langle a,b,c\mid aba=bab,bc=cb\rangle$ to $\mathbb{Z}$.
Apr 17, 2023
question
5
Group of an Elliptic curve.
Dec 3, 2021
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$\mathrm{GL}_n(\mathbb{Z}_2)=\mathrm{Out}(F_n)/\langle\langle \epsilon_1,\dots,\epsilon_n\rangle\rangle$
14
Abelianization of $\mathrm{GL}_n(\mathbb{Z})$
10
Homotopy type of the geometric realization of a poset
7
Geometric realization of a poset
5
Quotient of a $F_n$ group which is $F_n$