Description: Two virtual hypotheses virtually infer a theorem. (Contributed by Alan Sare, 14-Jun-2011) (Proof modification is discouraged.) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Hypothesis | vd02.1 | |
|
Assertion | vd02 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | vd02.1 | |
|
2 | 1 | a1i | |
3 | 2 | a1i | |
4 | 3 | dfvd2ir | |