In: Advanced Math
Let Kn denote the simple graph on n vertices.
(a) Let v be some vertex of Kn and consider K n −
v, the graph obtained by deleting
v. Prove that K n − v is isomorphic to K n−1 .
(b) Use mathematical induction on n to prove the following
statement:
K n , the complete graph on n vertices, has
n(n-1)/2
edges