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Mirrors > Home > NFE Home > Th. List > bitr4i | Unicode version |
Description: An inference from transitive law for logical equivalence. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
bitr4i.1 | |
bitr4i.2 |
Ref | Expression |
---|---|
bitr4i |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bitr4i.1 | . 2 | |
2 | bitr4i.2 | . . 3 | |
3 | 2 | bicomi 193 | . 2 |
4 | 1, 3 | bitri 240 | 1 |
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