Description: Deduction of restricted abstraction subclass from implication. (Contributed by Glauco Siliprandi, 21-Dec-2024)
Ref | Expression | ||
---|---|---|---|
Hypotheses | ss2rabdf.1 | ||
ss2rabdf.2 | |||
Assertion | ss2rabdf |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ss2rabdf.1 | ||
2 | ss2rabdf.2 | ||
3 | 2 | ex | |
4 | 1 3 | ralrimi | |
5 | ss2rab | ||
6 | 4 5 | sylibr |