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Related theorems Unicode version |
| Description: A mixed syllogism inference from a biconditional and an implication. Useful for substituting an antecedent with a definition. |
| Ref | Expression |
|---|---|
| sylbi.1 |
|
| sylbi.2 |
|
| Ref | Expression |
|---|---|
| sylbi |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sylbi.1 |
. . 3
| |
| 2 | 1 | biimp 151 |
. 2
|
| 3 | sylbi.2 |
. 2
| |
| 4 | 2, 3 | syl 10 |
1
|