Description: Add a disjunct in the antecedent of an implication. (Contributed by Rodolfo Medina, 24-Sep-2010)
Ref | Expression | ||
---|---|---|---|
Hypothesis | jao1i.1 | |- ( ps -> ( ch -> ph ) ) |
|
Assertion | jao1i | |- ( ( ph \/ ps ) -> ( ch -> ph ) ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | jao1i.1 | |- ( ps -> ( ch -> ph ) ) |
|
2 | ax-1 | |- ( ph -> ( ch -> ph ) ) |
|
3 | 2 1 | jaoi | |- ( ( ph \/ ps ) -> ( ch -> ph ) ) |