Proof of `The Noether–Lefschetz window of a surface in ℙ³ and the sequence A005581` (4th statement)
groundedproofs/Lax894236Proofs/NoetherLefschetzWindow.lean · lax-894236
What this proof establishes
no assumptions
Assuming the claims on the left, the claim on the right holds — checked by the archive's pipeline. Proof code is not displayed here.