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| Mirrors > Home > ILE Home > Th. List > bitrid | Unicode version | ||
| Description: A syllogism inference from two biconditionals. (Contributed by NM, 12-Mar-1993.) |
| Ref | Expression |
|---|---|
| bitrid.1 |
|
| bitrid.2 |
|
| Ref | Expression |
|---|---|
| bitrid |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | bitrid.1 |
. . 3
| |
| 2 | 1 | a1i 9 |
. 2
|
| 3 | bitrid.2 |
. 2
| |
| 4 | 2, 3 | bitrd 188 |
1
|
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