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Mirrors > Home > MPE Home > Th. List > imbi1d | Unicode version |
Description: Deduction adding a consequent to both sides of a logical equivalence. (Contributed by NM, 11-May-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 223 | . . 3 |
3 | 2 | imim1d 75 | . 2 |
4 | 1 | biimpd 207 | . . 3 |
5 | 4 | imim1d 75 | . 2 |
6 | 3, 5 | impbid 191 | 1 |
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