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Mirrors > Home > MPE Home > Th. List > pm2.65da | Structured version Visualization version Unicode version |
Description: Deduction rule for proof by contradiction. (Contributed by NM, 12-Jun-2014.) |
Ref | Expression |
---|---|
pm2.65da.1 |
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pm2.65da.2 |
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Ref | Expression |
---|---|
pm2.65da |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pm2.65da.1 |
. . 3
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2 | 1 | ex 440 |
. 2
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3 | pm2.65da.2 |
. . 3
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4 | 3 | ex 440 |
. 2
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5 | 2, 4 | pm2.65d 180 |
1
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