Description: Importation inference. (Contributed by Alan Sare, 17-Oct-2017)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | 3imp.1 | |- ( ph -> ( ps -> ( ch -> th ) ) ) |
|
| Assertion | 3imp231 | |- ( ( ps /\ ch /\ ph ) -> th ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 3imp.1 | |- ( ph -> ( ps -> ( ch -> th ) ) ) |
|
| 2 | 1 | com3l | |- ( ps -> ( ch -> ( ph -> th ) ) ) |
| 3 | 2 | 3imp | |- ( ( ps /\ ch /\ ph ) -> th ) |