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Mirrors > Home > ILE Home > Th. List > df-id | Unicode version |
Description: Define the identity relation. Definition 9.15 of [Quine] p. 64. For example, 5 5 and 4 5. (Contributed by NM, 13-Aug-1995.) |
Ref | Expression |
---|---|
df-id |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cid 4025 | . 2 | |
2 | vx | . . . 4 | |
3 | vy | . . . 4 | |
4 | 2, 3 | weq 1392 | . . 3 |
5 | 4, 2, 3 | copab 3817 | . 2 |
6 | 1, 5 | wceq 1243 | 1 |
Colors of variables: wff set class |
This definition is referenced by: reli 4465 ideqg 4487 opabresid 4659 cnvi 4728 dffun2 4912 ider 6139 |
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