Description: Inference to remove the trailing term. (Contributed by Jeff Hoffman, 17-Nov-2007) (Proof modification is discouraged.) (New usage is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | nic-idel.1 | |- ( ph -/\ ( ch -/\ ps ) ) |
|
| Assertion | nic-idel | |- ( ph -/\ ( ch -/\ ch ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nic-idel.1 | |- ( ph -/\ ( ch -/\ ps ) ) |
|
| 2 | nic-id | |- ( ch -/\ ( ch -/\ ch ) ) |
|
| 3 | 2 | nic-isw1 | |- ( ( ch -/\ ch ) -/\ ch ) |
| 4 | 1 | nic-imp | |- ( ( ( ch -/\ ch ) -/\ ch ) -/\ ( ( ph -/\ ( ch -/\ ch ) ) -/\ ( ph -/\ ( ch -/\ ch ) ) ) ) |
| 5 | 3 4 | nic-mp | |- ( ph -/\ ( ch -/\ ch ) ) |