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Mirrors > Home > NFE Home > Th. List > bitri | Unicode version |
Description: An inference from transitive law for logical equivalence. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 13-Oct-2012.) |
Ref | Expression |
---|---|
bitri.1 |
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bitri.2 |
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Ref | Expression |
---|---|
bitri |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bitri.1 |
. . . 4
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2 | 1 | biimpi 186 |
. . 3
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3 | bitri.2 |
. . 3
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4 | 2, 3 | sylib 188 |
. 2
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5 | 3 | biimpri 197 |
. . 3
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6 | 5, 1 | sylibr 203 |
. 2
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7 | 4, 6 | impbii 180 |
1
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