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 –1-1→ 𝐵 → Rel 𝐹 )

Proof

Step	Hyp	Ref	Expression
1		f1fn	⊢ ( 𝐹 : 𝐴 –1-1→ 𝐵 → 𝐹 Fn 𝐴 )
2		fnrel	⊢ ( 𝐹 Fn 𝐴 → Rel 𝐹 )
3	1 2	syl	⊢ ( 𝐹 : 𝐴 –1-1→ 𝐵 → Rel 𝐹 )