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Mirrors > Home > ILE Home > Th. List > mtbiri | Unicode version |
Description: An inference from a biconditional, similar to modus tollens. (Contributed by NM, 24-Aug-1995.) |
Ref | Expression |
---|---|
mtbiri.min |
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mtbiri.maj |
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Ref | Expression |
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mtbiri |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | mtbiri.min |
. 2
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2 | mtbiri.maj |
. . 3
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3 | 2 | biimpd 144 |
. 2
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4 | 1, 3 | mtoi 664 |
1
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