Description: Equivalence of redundancy of propositions. (Contributed by Peter Mazsa, 25-Oct-2022)
Ref | Expression | ||
---|---|---|---|
Hypothesis | redundpbi1.1 | ||
Assertion | redundpbi1 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | redundpbi1.1 | ||
2 | 1 | imbi1i | |
3 | 1 | anbi1i | |
4 | 3 | bibi1i | |
5 | 2 4 | anbi12i | |
6 | df-redundp | ||
7 | df-redundp | ||
8 | 5 6 7 | 3bitr4i |