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Mirrors > Home > MPE Home > Th. List > eldifd | Unicode version |
Description: If a class is in one class and not another, it is also in their difference. One-way deduction form of eldif 3485. (Contributed by David Moews, 1-May-2017.) |
Ref | Expression |
---|---|
eldifd.1 | |
eldifd.2 |
Ref | Expression |
---|---|
eldifd |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eldifd.1 | . 2 | |
2 | eldifd.2 | . 2 | |
3 | eldif 3485 | . 2 | |
4 | 1, 2, 3 | sylanbrc 664 | 1 |
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