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Mirrors > Home > MPE Home > Th. List > eleqtrd | Structured version Visualization version Unicode version |
Description: Deduction that substitutes equal classes into membership. (Contributed by NM, 14-Dec-2004.) |
Ref | Expression |
---|---|
eleqtrd.1 | |
eleqtrd.2 |
Ref | Expression |
---|---|
eleqtrd |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleqtrd.1 | . 2 | |
2 | eleqtrd.2 | . . 3 | |
3 | 2 | eleq2d 2687 | . 2 |
4 | 1, 3 | mpbid 222 | 1 |
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