Graph Theory: 06 Sum of Degrees is ALWAYS Twice the Number of Edges

This is usually the first Theorem that you will learn in Graph Theory. We explain the idea with an example and then give a proof that the sum of the degrees in a graph is twice the number of edges. --An introduction to Graph Theory by Dr. Sarada Herke. Links to the related videos:    • Graph Theory: 02. Definition of a Graph   - Graph Theory: 02. Definition of a Graph    • Graph Theory: 05. Connected and Regular Gr...   - Graph Theory: 05. Connected and Regular Graphs For quick videos about Math tips and useful facts, check out my other channel "Spoonful of Maths"    / spoonfulofmaths