Linked from
The 97 pages that link to Graph theory, each with the reason it gives.
Kőnig's lemmaNarrower topic: The lemma emerged from the study of infinite graphs and tree structure.
Edge coverNarrower topic: Edge covers are defined using the vertices and edges of a graph.
Nine Men's MorrisNarrower topic: The board can be modeled as points joined by legal movement paths.
Conway's thrackle conjectureNarrower topic: The conjecture bounds edges against vertices in a graph.
Fleischner's theoremNarrower topic: The theorem is a central result in structural graph theory.
Lovász conjectureNarrower topic: The conjecture is a central open problem in this field.
Peg solitaireNarrower topic: A board can be represented by holes and their spatial relations.