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Related theorems Unicode version |
| Description: An inference from a nested biconditional, related to modus ponens. |
| Ref | Expression |
|---|---|
| mpbiri.min |
|
| mpbiri.maj |
|
| Ref | Expression |
|---|---|
| mpbiri |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | mpbiri.min |
. 2
| |
| 2 | mpbiri.maj |
. . 3
| |
| 3 | 2 | biimprd 171 |
. 2
|
| 4 | 1, 3 | mpi 55 |
1
|