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Mirrors > Home > NFE Home > Th. List > anbi12i | Unicode version |
Description: Conjoin both sides of two equivalences. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
anbi12.1 | |
anbi12.2 |
Ref | Expression |
---|---|
anbi12i |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | anbi12.1 | . . 3 | |
2 | 1 | anbi1i 676 | . 2 |
3 | anbi12.2 | . . 3 | |
4 | 3 | anbi2i 675 | . 2 |
5 | 2, 4 | bitri 240 | 1 |
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