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Theorem fnfun 5181

Description: A function with domain is a function. (Contributed by set.mm contributors, 1-Aug-1994.)

**Assertion**
Ref	Expression
fnfun

**Proof of Theorem fnfun**
Step	Hyp	Ref	Expression
1		df-fn 4790	. 2 $/\$
2	1	simplbi 446	1

Colors of variables: wff setvar class

Syntax hints:

wi 4

wceq 1642

cdm 4772

wfun 4775

wfn 4776

This theorem was proved from axioms: ax-1 5 ax-2 6 ax-3 7 ax-mp 8

This theorem depends on definitions: df-bi 177 df-an 360 df-fn 4790

This theorem is referenced by: funfni 5183 fnco 5191 fnssresb 5195 ffun 5225 f1fun 5260 f1ofun 5289 fvelimab 5370 fvun1 5379 elpreima 5407 respreima 5410 fconst3 5457 enprmaplem3 6078 frecsuc 6322