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Definition df-dom_ 25717
Description: Definition of  dom_. (Contributed by FL, 24-Oct-2007.)
Assertion
Ref Expression
df-dom_  |-  dom_  =  ( 1st  o.  1st )

Detailed syntax breakdown of Definition df-dom_
StepHypRef Expression
1 cdom_ 25712 . 2  class  dom_
2 c1st 6120 . . 3  class  1st
32, 2ccom 4693 . 2  class  ( 1st 
o.  1st )
41, 3wceq 1623 1  wff  dom_  =  ( 1st  o.  1st )
Colors of variables: wff set class
This definition is referenced by:  domval  25723
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