List questions from ringed-spaces

Published on 01 Jul 2019 - 13:59

60

Views

Is flatness condition for proper base change actually needed?

Published on 04 Jul 2019 - 9:43

128

Views

Is there a "natural" categorical description of (pre-)sheaves of modules?

Published on 14 Jul 2019 - 10:09

90

Views

When the contravariant Hom functor of two finite type integral $k$-schemes are isomorphic on points

Published on 28 Aug 2019 - 23:20

160

Views

Prove: $U \mapsto \mathrm{Hom}(U, Y)$

Published on 19 Jun 2014 - 14:42

2.1k

Views

Does the category of locally ringed spaces have products?

Published on 22 Nov 2014 - 14:17

107

Views

Does it hold $\mathcal{O}_X (U) =\bigcap_{x \in U} \mathcal{O}_{X, x} \in K (X)$?

Published on 27 Nov 2014 - 1:06

67

Views

The spectrum of a not necessarily quasi-coherent sheaf of Algebras and a related vague question.

Published on 11 Oct 2019 - 8:01

399

Views

Condition of closed embedding

Published on 18 Oct 2019 - 21:52

543

Views

A closed subset of a prevariety is a prevariety

Published on 13 Nov 2019 - 1:07

114

Views

Is $\textbf{MAN}$ a full subcategory of $\textbf{LRS}$?

Published on 22 Nov 2019 - 2:27

567

Views

Characterisation of isomorphisms of ringed spaces

Published on 29 Nov 2019 - 20:09

67

Views

Computing $\mathscr O_X (X − \{x\})$ for $X$ an affine scheme

Published on 29 Jan 2020 - 9:09

107

Views

Locally ringed point space is not a scheme?

Published on 08 Mar 2020 - 1:53

49

Views

Map of global sections is inclusion map

Published on 28 Mar 2020 - 12:15

List Question

Proper base change for ringed spaces

Is flatness condition for proper base change actually needed?

Is there a "natural" categorical description of (pre-)sheaves of modules?

When the contravariant Hom functor of two finite type integral $k$-schemes are isomorphic on points

Prove: $U \mapsto \mathrm{Hom}(U, Y)$

Does the category of locally ringed spaces have products?

Does it hold $\mathcal{O}_X (U) =\bigcap_{x \in U} \mathcal{O}_{X, x} \in K (X)$?

The spectrum of a not necessarily quasi-coherent sheaf of Algebras and a related vague question.

Condition of closed embedding

A closed subset of a prevariety is a prevariety

Is $\textbf{MAN}$ a full subcategory of $\textbf{LRS}$?

Characterisation of isomorphisms of ringed spaces

Computing $\mathscr O_X (X − \{x\})$ for $X$ an affine scheme

Locally ringed point space is not a scheme?

Map of global sections is inclusion map

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