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Mirrors > Home > ILE Home > Th. List > sylbi | Unicode version |
Description: A mixed syllogism inference from a biconditional and an implication. Useful for substituting an antecedent with a definition. (Contributed by NM, 3-Jan-1993.) |
Ref | Expression |
---|---|
sylbi.1 | |
sylbi.2 |
Ref | Expression |
---|---|
sylbi |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sylbi.1 | . . 3 | |
2 | 1 | biimpi 119 | . 2 |
3 | sylbi.2 | . 2 | |
4 | 2, 3 | syl 14 | 1 |
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