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Mirrors > Home > ILE Home > Th. List > bitrdi | Unicode version |
Description: A syllogism inference from two biconditionals. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
bitrdi.1 | |
bitrdi.2 |
Ref | Expression |
---|---|
bitrdi |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bitrdi.1 | . 2 | |
2 | bitrdi.2 | . . 3 | |
3 | 2 | a1i 9 | . 2 |
4 | 1, 3 | bitrd 187 | 1 |
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