Caccetta-Häggkvist
Seymour's Second Neighbourhood Conjecture ★★★
Author(s): Seymour
Conjecture Any oriented graph has a vertex whose outdegree is at most its second outdegree.
Keywords: Caccetta-Häggkvist; neighbourhood; second; Seymour
Author(s): Seymour
Keywords: Caccetta-Häggkvist; neighbourhood; second; Seymour