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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 139 | . 2 | |
3 | 1, 2 | sylib 121 | 1 |
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