Description: A virtual hypothesis virtually infers a theorem. (Contributed by Alan Sare, 14-Jun-2011) (Proof modification is discouraged.) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Hypothesis | vd01.1 | |- ph |
|
Assertion | vd01 | |- (. ps ->. ph ). |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | vd01.1 | |- ph |
|
2 | 1 | a1i | |- ( ps -> ph ) |
3 | 2 | dfvd1ir | |- (. ps ->. ph ). |