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Definition df-id 4021
Description: Define the identity relation. Definition 9.15 of [Quine] p. 64. For example, 5  _I 5 and 4  _I 5. (Contributed by NM, 13-Aug-1995.)
Assertion
Ref Expression
df-id  _I  { <. , 
>.  |  }
Distinct variable group:   ,

Detailed syntax breakdown of Definition df-id
StepHypRef Expression
1 cid 4016 . 2  _I
2 vx . . . 4  setvar
3 vy . . . 4  setvar
42, 3weq 1389 . . 3
54, 2, 3copab 3808 . 2  { <. ,  >.  |  }
61, 5wceq 1242 1  _I  { <. , 
>.  |  }
Colors of variables: wff set class
This definition is referenced by:  reli  4408  ideqg  4430  opabresid  4602  cnvi  4671  dffun2  4855  ider  6075
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