Description: Quantification restricted to a subclass. (Contributed by NM, 11-Mar-2006) Avoid axioms. (Revised by GG, 19-May-2025)
Ref | Expression | ||
---|---|---|---|
Assertion | ssralv |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-ss | ||
2 | imim1 | ||
3 | 2 | al2imi | |
4 | df-ral | ||
5 | df-ral | ||
6 | 3 4 5 | 3imtr4g | |
7 | 1 6 | sylbi |