Proof of `Steiner Tree` (2nd statement)
groundedproofs/Lax799700Proofs/Bridge/Steiner.lean · lax-799700
What this proof establishes
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
Membership from the library's existential second-order definition of EdgeSteinerTree; hardness from the library's reduction out of VertexCover, which is NP-hard by the catalog’s statement for it. Both are transported to the catalog's problems along the agreements.