formalist(OPE-4): n-queens Level B statement pin (stub — do not merge with sorry) - #4
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…y on branch only) - New ProofLab/NQueensTheorem.lean: NonAttacking (Fin n → Fin n) and n_queens_exists_iff copied verbatim from the Scout pin; optional split queens_exists_of_four_le; both tagged STUB: proof in OPE-6 - decide-level sanity: NonAttacking ![1,3,0,2] (PR Paul3435#174 n=4 witness) - ProofLab.lean imports the new module; ProofLab/NQueens.lean untouched - STATEMENT.md: carries PR #3 text + appended 'Lean pin' section with build tail and #print axioms (now [sorryAx]; done requires none) - Verify: lake build ProofLab.NQueensTheorem exit 0, 2 sorry warnings Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This was referenced Sep 12, 2026
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Summary
ProofLab.NQueensTheorem.NonAttackingandn_queens_exists_iff, text copied verbatim fromcatalog/problems/n-queens/STATEMENT.md.queens_exists_of_four_le(then ≥ 4construction) as a second stub so OPE-6 can land/review the hard direction separately.sorrys, both tagged-- STUB: proof in OPE-6.#print axioms=[sorryAx]for both. Draft; must not merge tomainuntil OPE-6 removes them.ProofLab/NQueens.lean(Level A, PR OPE-1424: n-queens Level A (n=2 none / n=3 none / n=4 [1,3,0,2]) Paul3435/open-math-lab#174) untouched; new module imported fromProofLab.lean.STATEMENT.mdhere carries PR OPE-3: n-queens fresh Scout dossier + Level B statement pin (board-named) #3's rewrite plus an appended "Lean pin" section — merge after OPE-3: n-queens fresh Scout dossier + Level B statement pin (board-named) #3 (identical hunks, appended section merges cleanly either order).IsNQueens (List.ofFn q) ↔ NonAttacking qdeferred (real proof work, would be a thirdsorry).Verify
#print axioms ProofLab.NQueensTheorem.n_queens_exists_iff→[sorryAx](expected at this stage).Paperclip: OPE-4 (parent OPE-2).
🤖 Generated with Claude Code