Description: idn3 without virtual deduction connectives. Special theorem needed for the Virtual Deduction translation tool. (Contributed by Alan Sare, 23-Jul-2011) (Proof modification is discouraged.) (New usage is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | iidn3 | |- ( ph -> ( ps -> ( ch -> ch ) ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | id | |- ( ch -> ch ) |
|
| 2 | 1 | 2a1i | |- ( ph -> ( ps -> ( ch -> ch ) ) ) |