Metamath Proof Explorer

Theorem f1relOLD

Description: Obsolete version of f1rel as of 10-Jun-2026. (Contributed by NM, 8-Mar-2014) (Proof modification is discouraged.) (New usage is discouraged.)

		Ref	Expression
	Assertion	f1relOLD	$⊢ F : A \underset{1-1}{⟶} B \to Rel F$

Proof

Step	Hyp	Ref	Expression
1		f1fn	$⊢ F : A \underset{1-1}{⟶} B \to F Fn A$
2		fnrel	$⊢ F Fn A \to Rel F$
3	1 2	syl	$⊢ F : A \underset{1-1}{⟶} B \to Rel F$