Description: Alternate version of sb2vOLD . (Contributed by BJ, 31-May-2019) (Proof modification is discouraged.) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Hypothesis | dfsb1.ph | ||
Assertion | sb2vOLDALT |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfsb1.ph | ||
2 | sp | ||
3 | equs4v | ||
4 | 2 3 1 | sylanbrc |