Metamath Proof Explorer


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 )