Description: Change bound variables in a disjoint collection. (Contributed by Mario Carneiro, 11-Dec-2016)
Ref | Expression | ||
---|---|---|---|
Hypothesis | cbvdisjv.1 | ||
Assertion | cbvdisjv |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cbvdisjv.1 | ||
2 | 1 | eleq2d | |
3 | 2 | cbvrmovw | |
4 | 3 | albii | |
5 | df-disj | ||
6 | df-disj | ||
7 | 4 5 6 | 3bitr4i |