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| Description: Class identity law (reflexivity of class equality). Theorem 6.4 of [Quine] p. 41. |
| Ref | Expression |
|---|---|
| eqid |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pm4.2 170 |
. 2
| |
| 2 | 1 | eqriv 1451 |
1
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