List questions from affine-schemes

Published on 10 Apr 2026 - 2:25

132

Views

Can every maximal ideal of Dedekind domain be principal after restricting to a small enough distinguished open subset?

Published on 10 May 2026 - 18:27

210

Views

Zero-Dimensional Subschemes of Degree 21

Published on 14 Apr 2026 - 6:07

903

Views

Hartshorne Exercise III 3.2: $X$ is affine iff every component is affine

Published on 16 Apr 2026 - 12:33

149

Views

Gluing functions from irreducible components of a reduced curve if they agree on the intersection points

Published on 15 Apr 2026 - 17:29

336

Views

Open Affine subsets of $\mathbb{A}^n_k$ are principal

Published on 17 Apr 2026 - 8:57

96

Views

Principal affine open subschemes

Published on 11 Apr 2026 - 15:09

75

Views

Isomorphism of Ideal tensored with affine open and restriction of ideals

Published on 12 Apr 2026 - 3:31

35

Views

Trying to prove that $\mathbb{G}_m^2$ is isomorphic to $D_2$ (algebraic groups)

Published on 16 Apr 2026 - 13:15

695

Views

Value of the structure sheaf on a general open in Spec(R)

Published on 11 Apr 2026 - 4:57

101

Views

Covering scheme by affines, $X = \bigcup X_f$

Published on 14 Apr 2026 - 1:51

46

Views

Connected scheme which admits a monomorphism to an affine Noetherian scheme of finite Krull dimension

Published on 11 Apr 2026 - 19:45

78

Views

Connected scheme of dimension $0$ which admits a monomorphism to an affine scheme

Published on 11 Apr 2026 - 4:53

277

Views

Projective space $Proj$

Published on 10 May 2026 - 16:07

333

Views

Showing Proj $R[x,y]/(x^2)$ is not affine scheme

Published on 10 May 2026 - 16:13

List Question

What is a $k$-scheme isomorphism?

Can every maximal ideal of Dedekind domain be principal after restricting to a small enough distinguished open subset?

Zero-Dimensional Subschemes of Degree 21

Hartshorne Exercise III 3.2: $X$ is affine iff every component is affine

Gluing functions from irreducible components of a reduced curve if they agree on the intersection points

Open Affine subsets of $\mathbb{A}^n_k$ are principal

Principal affine open subschemes

Isomorphism of Ideal tensored with affine open and restriction of ideals

Trying to prove that $\mathbb{G}_m^2$ is isomorphic to $D_2$ (algebraic groups)

Value of the structure sheaf on a general open in Spec(R)

Covering scheme by affines, $X = \bigcup X_f$

Connected scheme which admits a monomorphism to an affine Noetherian scheme of finite Krull dimension

Connected scheme of dimension $0$ which admits a monomorphism to an affine scheme

Projective space $Proj$

Showing Proj $R[x,y]/(x^2)$ is not affine scheme

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