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| Mirrors > Home > ILE Home > Th. List > sylbir | Unicode version | ||
| Description: A mixed syllogism inference from a biconditional and an implication. (Contributed by NM, 5-Aug-1993.) | 
| Ref | Expression | 
|---|---|
| sylbir.1 | 
 | 
| sylbir.2 | 
 | 
| Ref | Expression | 
|---|---|
| sylbir | 
 | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | sylbir.1 | 
. . 3
 | |
| 2 | 1 | biimpri 133 | 
. 2
 | 
| 3 | sylbir.2 | 
. 2
 | |
| 4 | 2, 3 | syl 14 | 
1
 | 
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