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Mirrors > Home > ILE Home > Th. List > syl5bi | Unicode version |
Description: A mixed syllogism inference from a nested implication and a biconditional. Useful for substituting an embedded antecedent with a definition. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
syl5bi.1 | |
syl5bi.2 |
Ref | Expression |
---|---|
syl5bi |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | syl5bi.1 | . . 3 | |
2 | 1 | biimpi 119 | . 2 |
3 | syl5bi.2 | . 2 | |
4 | 2, 3 | syl5 32 | 1 |
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