TwinPrimes.lean`

Explanation legend Lean4 Domain Explanation Language (L4DEL)

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Annotation provenance. This overlay contains 10 curated AI-written annotations and 7190 mechanical source-derived annotations. They have not been human-reviewed as explanations; treat them as unverified and not mathematical authority. Retained generation history: The 71 original curated annotations were produced in a Claude Sonnet 5.5 session at medium effort; Claude Opus 5.5 is recorded in that session as the advisor model, not the direct author. The bulk source-derived expansion was generated mechanically from pinned source comments by tooling developed in a GPT-5.6 Sol session at ultra reasoning; GPT-5.6 Sol did not originate the quoted source prose. On 2026-10-17 the mechanically generated source-comment annotations of the Formal Conjectures, Carleson, FLT, PFR, CompFiles, Mathematics in Lean and Theorem Proving in Lean overlays were regenerated by the same generator after three corrections made in a Claude Sonnet 5.5 session: titles no longer cut a sentence inside mathematics or end on a dangling word, workflow markers are removed from the quoted prose, and declaration names follow the scanner's namespace resolution. The boilerplate step line was dropped, and comments that were only a row of dashes no longer yield annotations. No new prose was written and no human review is claimed.

Credit: The upstream authors and contributors retain credit for the project and mathematics. lean4-explainer only renders their pinned source and adds the separately disclosed explanation layer.

Project sources: Pinned project documentation, Formal Conjectures paper, arXiv v1

1 declarations, 1 contain sorry, 0 declared as axioms

Twin prime conjecture

References:

Imports (1)

FormalConjecturesUtil

theorem TwinPrimes.twin_primes The twin prime question sorry line 37 source
Source documentation
Are there infinitely many primes p such that p + 2 is prime?
L4DEL explanation
Are there infinitely many primes p for which p + 2 is also prime? The file marks this as open.
1. The statement has the form "answer(sorry) iff the set of p with p and p + 2 prime is infinite", so the answer slot is left unfilled.
2. The attribute reads category research open and the proof body is sorry.
Sources and attribution: Pinned Lean source (1646ca16afd6)
depends on sorry what this means
Statement uses: Iff, True, Set.Infinite, Nat, Set.ofPred, And, Prime, HAdd.hAdd, OfNat.ofNat
Proof uses: sorryAx, Lean.Name, Bool.false, Lean.Name.num, Lean.Name.str, Lean.Name.anonymous
8 instances, coercions and auxiliary constants left out.

Tactic trace: 1 steps
Open to load the checked before-and-after goal states.
```
theorem twin_primes :
    answer(sorry) ↔ {p : ℕ | Prime p ∧ Prime (p + 2)}.Infinite := by
…
```