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Mirrors > Home > MPE Home > Th. List > mtbid | Unicode version |
Description: A deduction from a biconditional, similar to modus tollens. (Contributed by NM, 26-Nov-1995.) |
Ref | Expression |
---|---|
mtbid.min | |
mtbid.maj |
Ref | Expression |
---|---|
mtbid |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | mtbid.min | . 2 | |
2 | mtbid.maj | . . 3 | |
3 | 2 | biimprd 223 | . 2 |
4 | 1, 3 | mtod 177 | 1 |
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