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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 |
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anbi12.2 |
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Ref | Expression |
---|---|
anbi12i |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | anbi12.1 |
. . 3
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2 | 1 | anbi1i 676 |
. 2
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3 | anbi12.2 |
. . 3
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4 | 3 | anbi2i 675 |
. 2
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5 | 2, 4 | bitri 240 |
1
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