Description: e012 without virtual deductions. (Contributed by Alan Sare, 14-Jul-2011) (Proof modification is discouraged.) (New usage is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | ee012.1 | |- ph |
|
| ee012.2 | |- ( ps -> ch ) |
||
| ee012.3 | |- ( ps -> ( th -> ta ) ) |
||
| ee012.4 | |- ( ph -> ( ch -> ( ta -> et ) ) ) |
||
| Assertion | ee012 | |- ( ps -> ( th -> et ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ee012.1 | |- ph |
|
| 2 | ee012.2 | |- ( ps -> ch ) |
|
| 3 | ee012.3 | |- ( ps -> ( th -> ta ) ) |
|
| 4 | ee012.4 | |- ( ph -> ( ch -> ( ta -> et ) ) ) |
|
| 5 | 1 | a1i | |- ( th -> ph ) |
| 6 | 5 | a1i | |- ( ps -> ( th -> ph ) ) |
| 7 | 2 | a1d | |- ( ps -> ( th -> ch ) ) |
| 8 | 6 7 3 4 | ee222 | |- ( ps -> ( th -> et ) ) |