Theorem f1fun 5601

Description: A one-to-one mapping is a function. (Contributed by NM, 8-Mar-2014.)

Assertion

Ref	Expression
f1fun	|- ( F : A -1-1-> B -> Fun F )

Proof of Theorem f1fun

Step	Hyp	Ref	Expression
1		f1fn 5600	. 2 |- ( F : A -1-1-> B -> F Fn A )
2		fnfun 5478	. 2 |- ( F Fn A -> Fun F )
3	1, 2	syl 14	1 |- ( F : A -1-1-> B -> Fun F )

This proof depends on syntax axioms:   -> wi 4   Fun wfun 5371   Fn wfn 5372   -1-1->wf1 5374

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106

This proof depends on definitions:  df-bi 117  df-fn 5380  df-f 5381  df-f1 5382

This theorem is used by:  f1cocnv2  5667  f1o2ndf1  6464  f1dmvrnfibi  7258  fsuppcorn  7301  djuinj  7446  usgrfun  16402