Question

Torsion in families of elliptic curves.

score 61 · Answer 1 · 2026-04-11 14:06:34

61

Views

Torsion in families of elliptic curves.

Published on 11 Apr 2026 - 14:06

score 76 · Answer 2 · 2026-04-16 20:21:27

76

Views

$I$ is prime ideal in $k[x_1, \dots , x_n]$ iif $I^h$ is prime ideal in $k[x_0, \dots , x_n]$

Published on 16 Apr 2026 - 20:21

score 121 · Answer 3 · 2026-04-15 00:09:47

121

Views

Question on ring of regular functions of a finite type variety

Published on 15 Apr 2026 - 0:09

score 115 · Answer 4 · 2026-04-24 02:37:51

115

Views

Finding an upper bound to the order of finite subgroup of the automorphism group of rational map

Published on 24 Apr 2026 - 2:37

score 48 · Answer 5 · 2026-04-14 01:55:48

48

Views

How many extra generators in the normalization of $\mathbb{C}[x,y]/f(x,y)$ vs. how many blow ups are needed.

Published on 14 Apr 2026 - 1:55

score 308 · Answer 6 · 2026-04-09 09:39:27

308

Views

What is a constant morphism of schemes

Published on 09 Apr 2026 - 9:39

score 105 · Answer 7 · 2026-04-16 04:41:18

105

Views

canonical height of elliptic curve has property $h(P+Q)+h(P-Q)=2h(P)+2h(Q)$. Is there any reason to expect it?

Published on 16 Apr 2026 - 4:41

score 379 · Answer 8 · 2026-04-17 07:42:22

379

Views

Dimension of $m/m^2$, where $m$ is the maximal ideal of $\mathcal{O}_{X\times Y,(x,y)}$

Published on 17 Apr 2026 - 7:42

score 120 · Answer 9 · 2026-04-15 23:55:14

120

Views

Looking for an example for $R$ valuation ring, $X$ scheme s.t. $\operatorname{Spec}(R)\to X$ image is not affine

Published on 15 Apr 2026 - 23:55

score 35 · Answer 10 · 2026-04-14 05:42:34

35

Views

Given ring homomorphism $A\to B$ with $A,B$ reduced, why can I replace $A$ by Im$(A)$ to check $\text{Spec}(B)\to \text{Spec}(A)$ is surjection?

Published on 14 Apr 2026 - 5:42

score 190 · Answer 11 · 2026-04-11 12:48:54

190

Views

References for the existence of fppf quotient of algebraic groups over a field

Published on 11 Apr 2026 - 12:48

score 34 · Answer 12 · 2026-04-18 09:47:19

34

Views

Is there a choice for ramification points for the covering of smooth algebraic curve over $P^1$?

Published on 18 Apr 2026 - 9:47

score 1.7k · Answer 13 · 2026-04-14 04:35:42

1.7k

Views

Precise general statement of flat morphisms being "equidimensional"

Published on 14 Apr 2026 - 4:35

score 103 · Answer 14 · 2026-03-25 07:55:30

103

Views

$\mathbb{A}^2_{\mathbb{Z}} \backslash \{(0,0)\}$ represents a functor & a beautiful glueing story

Published on 25 Mar 2026 - 7:55

score 311 · Answer 15 · 2026-04-15 21:01:47

311

Views

On the length of a zero dimensional locally complete intersection scheme.

Published on 15 Apr 2026 - 21:01

List Question

Torsion in families of elliptic curves.

$I$ is prime ideal in $k[x_1, \dots , x_n]$ iif $I^h$ is prime ideal in $k[x_0, \dots , x_n]$

Question on ring of regular functions of a finite type variety

Finding an upper bound to the order of finite subgroup of the automorphism group of rational map

How many extra generators in the normalization of $\mathbb{C}[x,y]/f(x,y)$ vs. how many blow ups are needed.

What is a constant morphism of schemes

canonical height of elliptic curve has property $h(P+Q)+h(P-Q)=2h(P)+2h(Q)$. Is there any reason to expect it?

Dimension of $m/m^2$, where $m$ is the maximal ideal of $\mathcal{O}_{X\times Y,(x,y)}$

Looking for an example for $R$ valuation ring, $X$ scheme s.t. $\operatorname{Spec}(R)\to X$ image is not affine

Given ring homomorphism $A\to B$ with $A,B$ reduced, why can I replace $A$ by Im$(A)$ to check $\text{Spec}(B)\to \text{Spec}(A)$ is surjection?

References for the existence of fppf quotient of algebraic groups over a field

Is there a choice for ramification points for the covering of smooth algebraic curve over $P^1$?

Precise general statement of flat morphisms being "equidimensional"

$\mathbb{A}^2_{\mathbb{Z}} \backslash \{(0,0)\}$ represents a functor & a beautiful glueing story

On the length of a zero dimensional locally complete intersection scheme.

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