Theorem fofun

Description: An onto mapping is a function. (Contributed by NM, 29-Mar-2008)

	Ref	Expression
Assertion	fofun	$$⊢F:A\underset{onto}{⟶}B\to \mathrm{Fun}F$$

Proof

Step	Hyp	Ref	Expression
1		fof	$$⊢F:A\underset{onto}{⟶}B\to F:A⟶B$$
2	1	ffund	$$⊢F:A\underset{onto}{⟶}B\to \mathrm{Fun}F$$