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Mirrors > Home > MPE Home > Th. List > ssdifssd | Structured version Visualization version Unicode version |
Description: If is contained in , then is also contained in . Deduction form of ssdifss 3741. (Contributed by David Moews, 1-May-2017.) |
Ref | Expression |
---|---|
ssdifd.1 |
Ref | Expression |
---|---|
ssdifssd |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssdifd.1 | . 2 | |
2 | ssdifss 3741 | . 2 | |
3 | 1, 2 | syl 17 | 1 |
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