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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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