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Definition df-domain 32478
Description: Define the domain function. See brdomain 32544 for its value. (Contributed by Scott Fenton, 11-Apr-2014.)
Assertion
Ref Expression
df-domain Domain = Image(1st ↾ (V × V))

Detailed syntax breakdown of Definition df-domain
StepHypRef Expression
1 cdomain 32454 . 2 class Domain
2 c1st 7397 . . . 4 class 1st
3 cvv 3383 . . . . 5 class V
43, 3cxp 5308 . . . 4 class (V × V)
52, 4cres 5312 . . 3 class (1st ↾ (V × V))
65cimage 32451 . 2 class Image(1st ↾ (V × V))
71, 6wceq 1653 1 wff Domain = Image(1st ↾ (V × V))
Colors of variables: wff setvar class
This definition is referenced by:  brdomain  32544
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