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Mirrors > Home > MPE Home > Th. List > preq2 | Structured version Visualization version Unicode version |
Description: Equality theorem for unordered pairs. (Contributed by NM, 15-Jul-1993.) |
Ref | Expression |
---|---|
preq2 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | preq1 4268 | . 2 | |
2 | prcom 4267 | . 2 | |
3 | prcom 4267 | . 2 | |
4 | 1, 2, 3 | 3eqtr4g 2681 | 1 |
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