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Definition df-domain 31974
Description: Define the domain function. See brdomain 32040 for its value. (Contributed by Scott Fenton, 11-Apr-2014.)
Assertion
Ref Expression
df-domain |- Domain = Image ( 1st |` ( _V X. _V ) )
Detailed syntax breakdown of Definition df-domain
StepHypRef Expression
1 cdomain 31950 . 2 class Domain
2 c1st 7166 . . . 4 class 1st
3 cvv 3200 . . . . 5 class _V
43, 3cxp 5112 . . . 4 class ( _V X. _V )
52, 4cres 5116 . . 3 class ( 1st |` ( _V X. _V ) )
65cimage 31947 . 2 class Image ( 1st |` ( _V X. _V ) )
71, 6wceq 1483 1 wff Domain = Image ( 1st |` ( _V X. _V ) )
Colors of variables: wff setvar class
This definition is referenced by:  brdomain  32040
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