Description: Definition of virtual deduction. (Contributed by Alan Sare, 21-Apr-2011) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Assertion | df-vd1 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
0 | wph | |
|
1 | wps | |
|
2 | 0 1 | wvd1 | |
3 | 0 1 | wi | |
4 | 2 3 | wb | |