DefinitionDefinition: Literature-sourcedProof: Not applicablejudge pass (gpt-5.6-terra)audited 2026-08-28

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.

Projective object

Definition

An object $P$ of an abelian category is projective when for every epimorphism $q : E ↠ M$ and every morphism $f : P \to M$ , there exists a morphism $\tilde{f} : P \to E$ with

$q \tilde{f} = f .$

The lift $\tilde{f}$ need not be unique.

Depends on

Abelian category

Dependency tree · 2 levels

Sources

Pavel Etingof, Shlomo Gelaki, Dmitri Nikshych, and Victor Ostrik, Tensor Categories, Definition 1.6.5