Theorem f1funOLD

Description: Obsolete version of f1fun as of 10-Jun-2026. (Contributed by NM, 8-Mar-2014) (Proof modification is discouraged.) (New usage is discouraged.)

	Ref	Expression
Assertion	f1funOLD	⊢ ( 𝐹 : 𝐴 –1-1→ 𝐵 → Fun 𝐹 )

Proof

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