Скачать или смотреть First Theorem of Directed Graphs | Digraph Theory

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Graph Theory course:    • Graph Theory  
Graph Theory exercises:    • Graph Theory Exercises  

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The first theorem of graph theory tells us that the degree sum of a graph is two times the number of edges, or two times its size. A similar theorem is true in directed graph theory, or digraph theory. This theorem states that the sum of the outdegrees of the vertices in a digraph equals the sum of the indegrees, and they're both equal to m, the size of the digraph (the number of directed edges/arcs it has). We'll go over why this theorem is true in today's lesson!

Intro to directed graphs:    • Intro to Directed Graphs | Digraph Theory  
First Theorem of Graph Theory:    • The First Theorem of Graph Theory | Graph ...  

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