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| Mirrors > Home > MPE Home > Th. List > mtbid | Structured version Visualization version 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 238 |
. 2
|
| 4 | 1, 3 | mtod 189 |
1
|
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