User Stabilo

1 vote

1 answer

136 views

Computation of extension groups in the category of pairs $(M,f)$

asked Nov 13, 2019 at 18:04

1 vote

0 answers

116 views

Compute Cech cohomology with two open sets

asked Jul 25, 2020 at 8:26

1 vote

0 answers

562 views

Fourier expansions at the cusps of $\Gamma_0(N)$

asked Feb 3, 2015 at 22:42

1 vote

0 answers

152 views

The Linnik problem for dimension $2$

asked Jun 24, 2016 at 17:06

1 vote

1 answer

1k views

Eisenstein series of weight $2$ for $\Gamma_0(N)$ : where am I wrong?

asked Apr 25, 2015 at 20:36

1 vote

0 answers

82 views

If $A$ is an integer ring such that each $P \in A_L[X]$ has a finite number of zeros in $A$, is $A$ commutative?

asked Dec 11, 2015 at 17:27

1 vote

1 answer

191 views

If $A\subset B$, what to say about their $\operatorname{Proj}$?

asked Nov 6, 2017 at 11:51

1 vote

0 answers

148 views

Reducibility of the Weil representation

asked Aug 3, 2018 at 11:43

1 vote

0 answers

160 views

Can morphisms of Mayer-Vietoris triangles be completed into a $3\times 3$ square?

asked Aug 25, 2020 at 13:11

1 vote

0 answers

51 views

Do we have $\cap_{P\in S}\left(\mathcal{O}_P+(1-\tau)(K)\right)=\left(\cap_{P\in S}\mathcal{O}_P\right)+(1-\tau)(K)$?

asked Nov 7, 2020 at 13:45

1 vote

1 answer

117 views

When is the Tor-dimension of $R/(r)$ strictly smaller than that of $R$?

asked Sep 13, 2023 at 11:11

1 vote

1 answer

130 views

Is the projective dimension of finite torsion-free modules over regular ring of dimension $n$ smaller that $n$?

asked Sep 13, 2023 at 12:48

0 votes

0 answers

94 views

$\operatorname{Ext}$-group in the category of modules versus in the subcategory of finitely generated ones

asked Mar 5, 2022 at 13:30

Stack Exchange Network

43 Questions

Computation of extension groups in the category of pairs $(M,f)$

Compute Cech cohomology with two open sets

Fourier expansions at the cusps of $\Gamma_0(N)$

The Linnik problem for dimension $2$

Eisenstein series of weight $2$ for $\Gamma_0(N)$ : where am I wrong?

If $A$ is an integer ring such that each $P \in A_L[X]$ has a finite number of zeros in $A$, is $A$ commutative?

If $A\subset B$, what to say about their $\operatorname{Proj}$?

Reducibility of the Weil representation

Can morphisms of Mayer-Vietoris triangles be completed into a $3\times 3$ square?

Do we have $\cap_{P\in S}\left(\mathcal{O}_P+(1-\tau)(K)\right)=\left(\cap_{P\in S}\mathcal{O}_P\right)+(1-\tau)(K)$?

When is the Tor-dimension of $R/(r)$ strictly smaller than that of $R$?

Is the projective dimension of finite torsion-free modules over regular ring of dimension $n$ smaller that $n$?

$\operatorname{Ext}$-group in the category of modules versus in the subcategory of finitely generated ones