Metamath Proof Explorer

Theorem ffunOLD

Description: Obsolete version of ffun as of 10-Jun-2026. (Contributed by NM, 3-Aug-1994) (Proof modification is discouraged.) (New usage is discouraged.)

		Ref	Expression
	Assertion	ffunOLD	$⊢ F : A ⟶ B \to Fun F$

Proof

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