Theorem ffun

Description: A mapping is a function. (Contributed by NM, 3-Aug-1994)

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

Proof

Step	Hyp	Ref	Expression
1		ffn	$$⊢F:A⟶B\to FFnA$$
2		fnfun	$$⊢FFnA\to \mathrm{Fun}F$$
3	1 2	syl	$$⊢F:A⟶B\to \mathrm{Fun}F$$