Closed immersions and quasi-coherent sheaves,” Definition 29.4.4 and Lemma 29.4.5

Authors, T. S. P. (2026). Closed immersions and quasi-coherent sheaves,” Definition 29.4.4 and Lemma 29.4.5.

Type

Unclassified

Intellectual base

Unclassified

Year

2026

Link

https://stacks.math.columbia.edu/tag/01QX

Cited by

2 citations across 2 artifacts.

Each citation links to the sentence it supports in the citing article.

Domain-specific

• Fiber Product of Schemes
  • Not automatically a reduced intersection. A fiber product of closed subschemes is their scheme-theoretic intersection and can retain nilpotents at tangencies or embedded structure.

    This sourceIdentifies the scheme-theoretic intersection with the fiber product and computes it using \(A/(I+J)\).

• Ideal sheaf
  • The entry uses ordinary ringed spaces and schemes; analytic, formal, logarithmic, equivariant, and derived ideal objects require their own categorical hypotheses.

Verification

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Registry ID ref:cfc666489a66 · see in the full table