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Definition df-domfn 5770
Description: Define the domain function. This is a function wrapper for the domain operator. (Contributed by Scott Fenton, 9-Aug-2019.)
Assertion
Ref Expression
df-domfn Dom = (x V dom x)

Detailed syntax breakdown of Definition df-domfn
StepHypRef Expression
1 cdomfn 5769 . 2 class Dom
2 vx . . 3 setvar x
3 cvv 2859 . . 3 class V
42cv 1641 . . . 4 class x
54cdm 4772 . . 3 class dom x
62, 3, 5cmpt 5651 . 2 class (x V dom x)
71, 6wceq 1642 1 wff Dom = (x V dom x)
Colors of variables: wff setvar class
This definition is referenced by:  fvdomfn  5868  domfnex  5870
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