Theorem f1fn

Description: A one-to-one mapping is a function on its domain. (Contributed by NM, 8-Mar-2014)

	Ref	Expression
Assertion	f1fn	$$⊢F:A\underset{1-1}{⟶}B\to FFnA$$

Proof

Step	Hyp	Ref	Expression
1		f1f	$$⊢F:A\underset{1-1}{⟶}B\to F:A⟶B$$
2	1	ffnd	$$⊢F:A\underset{1-1}{⟶}B\to FFnA$$