Description: Equivalent wff's yield equal restricted class abstractions (deduction form). (Contributed by NM, 10-Feb-1995)
Ref | Expression | ||
---|---|---|---|
Hypothesis | rabbidv.1 | |
|
Assertion | rabbidv | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rabbidv.1 | |
|
2 | 1 | adantr | |
3 | 2 | rabbidva | |