Q: Prove by induction that:
1*1!+2*2!+…+n*n! = (n+1)! – 1
Category: Proof
Proof with functions
Q: Let f and g be invertible functions such that:
f: S –> T
g: T –>U
(1) Show g compose f is invertible and,
(2) that (g compose f) inverse = (f inverse) compose (g inverse)
