Description: Deduction introducing two antecedents. Two applications of a1d . Deduction associated with 2a1 and 2a1i . (Contributed by BJ, 10-Aug-2020)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | 2a1d.1 | |- ( ph -> ps ) |
|
| Assertion | 2a1d | |- ( ph -> ( ch -> ( th -> ps ) ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 2a1d.1 | |- ( ph -> ps ) |
|
| 2 | 1 | a1d | |- ( ph -> ( th -> ps ) ) |
| 3 | 2 | a1d | |- ( ph -> ( ch -> ( th -> ps ) ) ) |