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Definition df-id 4800
Description: Define the identity relation. Definition 9.15 of [Quine] p. 64. For example, and (ex-id 25155). (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 4795 . 2
2 vx . . . 4
3 vy . . . 4
42, 3weq 1733 . . 3
54, 2, 3copab 4509 . 2
61, 5wceq 1395 1
Colors of variables: wff setvar class
This definition is referenced by:  dfid3  4801  ideqg  5159  cnvi  5415  dffun2  5603  dfid4  29103  bj-elid  34599
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