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| Mirrors > Home > MPE Home > Th. List > eldifd | Structured version Visualization version 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 3584. (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 3584 |
. 2
| |
| 4 | 1, 2, 3 | sylanbrc 698 |
1
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