KnowraWagner's theoremLinked fromLinked fromThe 4 pages that link to Wagner's theorem, each with the reason it gives.All 4Broader topic 1Related 2Compared with 1Planar graphRelated: It gives a minor-based characterization parallel to Kuratowski’s subdivision criterion.Graph minorRelated: It gives a concise forbidden-minor test for planarity.Robertson–Seymour theoremBroader topic: It is a classical finite forbidden-minor characterization of a minor-closed family.Graph structure theoremCompared with: It is a concrete excluded-minor characterization, unlike the general structural description.