Proof of `The Cook–Levin theorem, by first-order reductions` (3rd statement)
groundedproofs/Lax904597Proofs/Bridge.lean · lax-904597
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.
Description
SAT is existential second-order definable: guess a truth assignment and check every clause in first-order logic.