Proof of `Triangles are outerplanar`
groundedproofs/Lax68Proofs/Relationships.lean · lax-68
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
Triangles are maximal outerplanar, and maximal outerplanar graphs are outerplanar.