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| Mirrors > Home > ILE Home > Th. List > mpbiri | Unicode version | ||
| Description: An inference from a nested biconditional, related to modus ponens. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 25-Oct-2012.) |
| Ref | Expression |
|---|---|
| mpbiri.min |
|
| mpbiri.maj |
|
| Ref | Expression |
|---|---|
| mpbiri |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | mpbiri.min |
. . 3
| |
| 2 | 1 | a1i 9 |
. 2
|
| 3 | mpbiri.maj |
. 2
| |
| 4 | 2, 3 | mpbird 167 |
1
|
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