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Mirrors > Home > MPE Home > Th. List > sseq12d | Structured version Visualization version Unicode version |
Description: An equality deduction for the subclass relationship. (Contributed by NM, 31-May-1999.) |
Ref | Expression |
---|---|
sseq1d.1 |
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sseq12d.2 |
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Ref | Expression |
---|---|
sseq12d |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sseq1d.1 |
. . 3
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2 | 1 | sseq1d 3461 |
. 2
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3 | sseq12d.2 |
. . 3
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4 | 3 | sseq2d 3462 |
. 2
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5 | 2, 4 | bitrd 257 |
1
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