Description: Alternate definition of the conditional operator for propositions. (Contributed by BJ, 30-Sep-2019)
Ref | Expression | ||
---|---|---|---|
Assertion | dfifp3 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfifp2 | |
|
2 | pm4.64 | |
|
3 | 2 | anbi2i | |
4 | 1 3 | bitri | |