Description: Infer implication from triple disjunction. (Contributed by NM, 26-Sep-2006)
Ref | Expression | ||
---|---|---|---|
Hypothesis | 3ori.1 | |
|
Assertion | 3ori | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 3ori.1 | |
|
2 | ioran | |
|
3 | df-3or | |
|
4 | 1 3 | mpbi | |
5 | 4 | ori | |
6 | 2 5 | sylbir | |