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| Mirrors > Home > MPE Home > Th. List > mpbii | Structured version Visualization version Unicode version | ||
| Description: An inference from a nested biconditional, related to modus ponens. (Contributed by NM, 16-May-1993.) (Proof shortened by Wolf Lammen, 25-Oct-2012.) |
| Ref | Expression |
|---|---|
| mpbii.min |
|
| mpbii.maj |
|
| Ref | Expression |
|---|---|
| mpbii |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | mpbii.min |
. . 3
| |
| 2 | 1 | a1i 11 |
. 2
|
| 3 | mpbii.maj |
. 2
| |
| 4 | 2, 3 | mpbid 222 |
1
|
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