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| Mirrors > Home > ILE Home > Th. List > biimtrid | 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 |
|---|---|
| biimtrid.1 |
|
| biimtrid.2 |
|
| Ref | Expression |
|---|---|
| biimtrid |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | biimtrid.1 |
. . 3
| |
| 2 | 1 | biimpi 120 |
. 2
|
| 3 | biimtrid.2 |
. 2
| |
| 4 | 2, 3 | syl5 32 |
1
|
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