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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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