Description: Move conjunction outside of biconditional. (Contributed by Mario Carneiro, 11-Sep-2015)
Ref | Expression | ||
---|---|---|---|
Hypothesis | baibd.1 | |
|
Assertion | baibd | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | baibd.1 | |
|
2 | ibar | |
|
3 | 2 | bicomd | |
4 | 1 3 | sylan9bb | |