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Mirrors > Home > MPE Home > Th. List > preq12d | Structured version Visualization version Unicode version |
Description: Equality deduction for unordered pairs. (Contributed by NM, 19-Oct-2012.) |
Ref | Expression |
---|---|
preq1d.1 | |
preq12d.2 |
Ref | Expression |
---|---|
preq12d |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | preq1d.1 | . 2 | |
2 | preq12d.2 | . 2 | |
3 | preq12 4270 | . 2 | |
4 | 1, 2, 3 | syl2anc 693 | 1 |
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