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Mirrors > Home > MPE Home > Th. List > sseq2d | Structured version Visualization version Unicode version |
Description: An equality deduction for the subclass relationship. (Contributed by NM, 14-Aug-1994.) |
Ref | Expression |
---|---|
sseq1d.1 |
Ref | Expression |
---|---|
sseq2d |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sseq1d.1 | . 2 | |
2 | sseq2 3627 | . 2 | |
3 | 1, 2 | syl 17 | 1 |
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