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| Description: Deduction adding a left conjunct to both sides of a logical equivalence. |
| Ref | Expression |
|---|---|
| bid.1 |
|
| Ref | Expression |
|---|---|
| anbi2d |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | bid.1 |
. . . 4
| |
| 2 | 1 | biimpd 153 |
. . 3
|
| 3 | 2 | anim2d 561 |
. 2
|
| 4 | 1 | biimprd 154 |
. . 3
|
| 5 | 4 | anim2d 561 |
. 2
|
| 6 | 3, 5 | impbid 516 |
1
|