List questions from ringed-spaces

Published on 23 Feb 2026 - 5:13

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Definition of smooth manifold using sheaves.

Published on 23 Feb 2026 - 5:10

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Is the adjunct of the comorphism for a closed immersion of ringed spaces an isomorphism?

Published on 23 Feb 2026 - 5:15

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Stalks and closed immersion

Published on 05 Apr 2026 - 20:57

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The radical presheaf is not a sheaf

Published on 23 Feb 2026 - 5:10

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Locally, every coherent sheaf is isomorphic to the cokernel of a homomorphism $\phi: \mathcal{A}^q \to \mathcal{A}^p$

Published on 23 Feb 2026 - 5:15

101

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On a ringed space: If a section has zero germ at $x$, must it be zero on some neighborhood of $x$?

Published on 23 Feb 2026 - 5:14

35

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"Punctured stalk" of a locally ringed space (at a closed point) is the fraction field of the stalk?

Published on 23 Feb 2026 - 5:15

52

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Do restrictions preserve ring structure of ringed space?

Published on 23 Feb 2026 - 5:10

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Is there a morphism of ringed spaces between smooth (resp., complex) manifolds that is not local?

Published on 23 Feb 2026 - 5:12

121

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Subvarieties of an abstract affine variety

Published on 23 Feb 2026 - 5:13

68

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Spectrum is ringed space

Published on 05 Apr 2026 - 17:10

117

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Characterization of isomorphisms of ringed spaces

Published on 23 Feb 2026 - 5:12

55

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More examples of morphisms of ringed spaces that aren't local?

Published on 23 Feb 2026 - 5:13

60

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Existence of a sheafification for every presheaf $ \mathcal{O} '$

Published on 09 Apr 2026 - 2:08

List Question

Why is the ring of local-ring valued points of a ring scheme a local ring.

Definition of smooth manifold using sheaves.

Is the adjunct of the comorphism for a closed immersion of ringed spaces an isomorphism?

Stalks and closed immersion

The radical presheaf is not a sheaf

Locally, every coherent sheaf is isomorphic to the cokernel of a homomorphism $\phi: \mathcal{A}^q \to \mathcal{A}^p$

On a ringed space: If a section has zero germ at $x$, must it be zero on some neighborhood of $x$?

"Punctured stalk" of a locally ringed space (at a closed point) is the fraction field of the stalk?

Do restrictions preserve ring structure of ringed space?

Is there a morphism of ringed spaces between smooth (resp., complex) manifolds that is not local?

Subvarieties of an abstract affine variety

Spectrum is ringed space

Characterization of isomorphisms of ringed spaces

More examples of morphisms of ringed spaces that aren't local?

Existence of a sheafification for every presheaf $ \mathcal{O} '$

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