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Mirrors > Home > MPE Home > Th. List > mtbiri | Structured version Visualization version Unicode version |
Description: An inference from a biconditional, similar to modus tollens. (Contributed by NM, 24-Aug-1995.) |
Ref | Expression |
---|---|
mtbiri.min | |
mtbiri.maj |
Ref | Expression |
---|---|
mtbiri |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | mtbiri.min | . 2 | |
2 | mtbiri.maj | . . 3 | |
3 | 2 | biimpd 219 | . 2 |
4 | 1, 3 | mtoi 190 | 1 |
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