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Mirrors > Home > MPE Home > Th. List > mtod | Structured version Visualization version Unicode version |
Description: Modus tollens deduction. (Contributed by NM, 3-Apr-1994.) (Proof shortened by Wolf Lammen, 11-Sep-2013.) |
Ref | Expression |
---|---|
mtod.1 | |
mtod.2 |
Ref | Expression |
---|---|
mtod |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | mtod.2 | . 2 | |
2 | mtod.1 | . . 3 | |
3 | 2 | a1d 25 | . 2 |
4 | 1, 3 | pm2.65d 187 | 1 |
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