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| Mirrors > Home > MPE Home > Th. List > con3d | Structured version Visualization version Unicode version | ||
| Description: A contraposition deduction. Deduction form of con3 149. (Contributed by NM, 10-Jan-1993.) |
| Ref | Expression |
|---|---|
| con3d.1 |
|
| Ref | Expression |
|---|---|
| con3d |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | notnotr 125 |
. . 3
| |
| 2 | con3d.1 |
. . 3
| |
| 3 | 1, 2 | syl5 34 |
. 2
|
| 4 | 3 | con1d 139 |
1
|
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