Alphabeta Math
ExampleConstruction: AI-generatedVerification: 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.

The short five lemma chased with members

Example

In Ab, the identity morphism between the short exact sequence 0→Z→×2Z→Z/2→0 and itself is the simplest concrete member chase for the short five lemma.

Facts & Assumptions

Given: The identity ladder on the displayed short exact sequence.

[L1]

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

[L2]

The short five lemma holds in every abelian category (Short five lemma in an abelian category).

Verification

1.1

Every member of the source sequence is carried to the identical member in the target sequence, so the outer comparison maps are isomorphisms in Ab.

L1algebra
2.1

The proof of [L2] then specializes to the tautological chase that the middle identity map is both monic and epic. This example is trivial on purpose: it shows the member language in the easiest possible concrete case.

L2step 1.1
3.1

Hence the identity ladder on a short exact sequence of abelian groups is a concrete instance of the short five lemma.

step 2.1∎

Depends on

Used by

Nothing in the library uses this result yet.

Dependency tree · two levels

15 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