DefinitionDefinition: Literature-sourcedProof: Not applicablejudge pass (gpt-5.6-terra)audited 2026-09-06‡ rests on unproved material (inherited)

How statement and proof provenance work

The first chip identifies the source of the statement or construction; the second identifies the source of its local proof or verification.

Literature-sourced: the exact statement appears in a cited source; only wording and notation differ.
AI-adapted: a semantically identical restatement of literature-sourced material, modulo indexing, notation, and boundary cases adopted by the library.
AI-generated: a genuinely novel statement formulated by AI, with no source for the claim itself.

These labels describe origin, not correctness: citations and verification chips remain separate evidence.

‡ Rests on 3 statements not proved in this library, by way of the results it cites. This item cites no such statement directly; it depends on results that do. The unproved premises it inherits are ‡ Cohen's first model: an infinite Dedekind-finite set of reals, ‡ Sierpiński 1947: the generalised continuum hypothesis implies the Axiom of Choice and ‡ The continuum hypothesis and its generalisation are independent of ZFC. Each is recorded with a citation to the literature and is not established here, because the track that would prove it has not yet been developed in this library. Everything else in this proof is proved here.

Affine schemes and their coordinate rings

Definition

An affine scheme is a locally ringed space isomorphic to $(Spec A, O_{Spec A})$ for some ring $A$ . Such an $A$ is a coordinate ring; it is canonically recovered as the global sections after a chosen affine presentation.

Depends on

Used by

Every affine scheme is quasi-compact Corollary
An affine nilpotent thickening Definition
Closed points of an affine scheme Definition
Generic points of irreducible closed subsets Definition
Reduced affine schemes Definition
The affine scheme of dual numbers Definition
The functor of points of an affine scheme Definition
The map of affine spectra induced by a ring homomorphism Definition
The spectrum of a product ring is a disjoint union Example
Affine schemes are contravariantly equivalent to commutative rings Theorem

Dependency tree · two levels

10 results within two dependency steps of this one, each drawn at its shortest distance from it. An arrow runs from a result to what uses it, so the chart reads left to right and ends at this result, which carries a heavier outline. Every node is a link to that result. Click elsewhere on the chart to enlarge it.

Sources

The Stacks Project, Definition 26.5.5 (standard reference, not scraped)