vertex-deleted digraph
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New digraph reconstruction conjecture — Unsolved problems in mathematics Are digraphs uniquely determined by their subgraphs? The reconstruction conjecture of Stanislaw Ulam is one of the best known open problems in graph theory. Using the terminology of Frank Harary[1] it can be… … Wikipedia
List of unsolved problems in mathematics — This article lists some unsolved problems in mathematics. See individual articles for details and sources. Contents 1 Millennium Prize Problems 2 Other still unsolved problems 2.1 Additive number theory … Wikipedia
Graph theory — In mathematics and computer science, graph theory is the study of graphs : mathematical structures used to model pairwise relations between objects from a certain collection. A graph in this context refers to a collection of vertices or nodes and … Wikipedia
