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Definition df-id 4657
Description: Define the identity relation. Definition 9.15 of [Quine] p. 64. For example, and (ex-id 22763). (Contributed by NM, 13-Aug-1995.)
Assertion
Ref Expression
df-id
Distinct variable group:   ,

Detailed syntax breakdown of Definition df-id
StepHypRef Expression
1 cid 4652 . 2
2 vx . . . 4
3 vy . . . 4
42, 3weq 1671 . . 3
54, 2, 3copab 4375 . 2
61, 5wceq 1670 1
Colors of variables: wff set class
This definition is referenced by:  dfid3  4658  ideqg  5013  cnvi  5263  dffun2  5448  dfid4  26522
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