Description: Universal quantification over a class abstraction. (Contributed by Jeff Madsen, 10-Jun-2010)
Ref | Expression | ||
---|---|---|---|
Hypothesis | ralab.1 | ||
Assertion | ralab |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ralab.1 | ||
2 | df-ral | ||
3 | vex | ||
4 | 3 1 | elab | |
5 | 4 | imbi1i | |
6 | 5 | albii | |
7 | 2 6 | bitri |