Description: A syllogism inference from two biconditionals. (Contributed by NM, 25-Nov-1994)
Ref | Expression | ||
---|---|---|---|
Hypotheses | bitr3di.1 | |
|
bitr3di.2 | |
||
Assertion | bitr3di | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bitr3di.1 | |
|
2 | bitr3di.2 | |
|
3 | 2 | bicomi | |
4 | 3 1 | bitr2id | |