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| Mirrors > Home > ILE Home > Th. List > bicomd | Unicode version | ||
| Description: Commute two sides of a biconditional in a deduction. (Contributed by NM, 5-Aug-1993.) | 
| Ref | Expression | 
|---|---|
| bicomd.1 | 
 | 
| Ref | Expression | 
|---|---|
| bicomd | 
 | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | bicomd.1 | 
. 2
 | |
| 2 | bicom 140 | 
. 2
 | |
| 3 | 1, 2 | sylib 122 | 
1
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