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Mirrors > Home > MPE Home > Th. List > imbi2d | Unicode version |
Description: Deduction adding an antecedent to both sides of a logical equivalence. (Contributed by NM, 11-May-1993.) |
Ref | Expression |
---|---|
imbid.1 |
Ref | Expression |
---|---|
imbi2d |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | imbid.1 | . . 3 | |
2 | 1 | a1d 25 | . 2 |
3 | 2 | pm5.74d 247 | 1 |
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