Theorem ffun

Description: A mapping is a function. (Contributed by NM, 3-Aug-1994) (Proof shortened by Umit Teoman Dogan, 10-Jun-2026)

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

Proof

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