Description: Disjunction of three antecedents. (Contributed by NM, 13-Sep-2011) (Proof shortened by Hongxiu Chen, 29-Jun-2025)
Ref | Expression | ||
---|---|---|---|
Assertion | 3jaob |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pm5.53 | ||
2 | df-3or | ||
3 | 2 | imbi1i | |
4 | df-3an | ||
5 | 1 3 4 | 3bitr4i |