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| Mirrors > Home > ILE Home > Th. List > imbi1d | Unicode version | ||
| Description: Deduction adding a consequent to both sides of a logical equivalence. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 17-Sep-2013.) | 
| Ref | Expression | 
|---|---|
| imbid.1 | 
 | 
| Ref | Expression | 
|---|---|
| imbi1d | 
 | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | imbid.1 | 
. . . 4
 | |
| 2 | 1 | biimprd 158 | 
. . 3
 | 
| 3 | 2 | imim1d 75 | 
. 2
 | 
| 4 | 1 | biimpd 144 | 
. . 3
 | 
| 5 | 4 | imim1d 75 | 
. 2
 | 
| 6 | 3, 5 | impbid 129 | 
1
 | 
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