Alphabeta Math
False statementConstruction: AI-adaptedVerification: AI-generatedprecheck passjudge pass (gpt-5.6-terra)audited 2026-08-30‡ 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.

FALSE: every quasi-isomorphism is an isomorphism of complexes

Statement

Every quasi-isomorphism of chain complexes is an isomorphism in Ch⁡(A).

Facts & Assumptions

Given: The zero map from the acyclic complex 0→Z→1ZZ→0 to the zero complex.

[L1]

A quasi-isomorphism is a chain map inducing isomorphisms on homology (Quasi-isomorphism).

[L2]

Ab is an abelian category (Abelian groups form an abelian category).

Refutation

technique · direct
1.1

As in the standard identity-complex computation, the source complex is acyclic and the target zero complex is also acyclic, so every homology object on both sides is zero. Therefore the zero chain map induces isomorphisms on all homology objects and is a quasi-isomorphism by [L1].

L1L2givenalgebra
2.1

The source complex is nonzero while the target is zero, so no inverse chain map can exist. Thus this quasi-isomorphism is not an isomorphism of complexes.

step 1.1algebra∎

Depends on

Used by

Dependency tree · two levels

12 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