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Mirrors > Home > ILE Home > Th. List > anbi2d | Unicode version |
Description: Deduction adding a left conjunct to both sides of a logical equivalence. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 16-Nov-2013.) |
Ref | Expression |
---|---|
anbid.1 |
Ref | Expression |
---|---|
anbi2d |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | anbid.1 | . . 3 | |
2 | 1 | a1d 22 | . 2 |
3 | 2 | pm5.32d 447 | 1 |
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