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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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