ExampleConstruction: Literature-sourcedVerification: AI-adaptedPipeline-generatedprecheck passjudge pass (gpt-5.6-terra)audited 2026-09-06

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.

Koszul D Square Sign Check Three Elements

Example

For $e_{1} \land e_{2} \land e_{3}$ , expand $d^{2}$ and pair the two appearances of each $x_{i} x_{j} e_{k}$ with opposite signs.

Facts & Assumptions

Given: The rings, finite sequences, modules, and local hypotheses stated in the claim. The declared prerequisites used here are Koszul Differential Coordinate Formula, Koszul Differential Square Pairwise Cancellation.

Proof

technique · direct

1.1

After one differential the three terms are $x_{1} e_{2} \land e_{3} - x_{2} e_{1} \land e_{3} + x_{3} e_{1} \land e_{2}$ .

givenalgebra

2.1

The second differential produces each $x_{i} x_{j} e_{k}$ twice with opposite signs, so the total is zero.

step 1.1algebra∎

Depends on

Used by

Nothing in the library uses this result yet.

Dependency tree · two levels

5 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, Koszul complexes and regular sequences (standard reference, not scraped)