Description: Alternate version of sb4vOLD . (Contributed by BJ, 23-Jul-2019) (Proof modification is discouraged.) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Hypothesis | dfsb1.ph | ||
Assertion | sb4vOLDALT |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfsb1.ph | ||
2 | 1 | sb1ALT | |
3 | sb56 | ||
4 | 2 3 | sylib |