Description: Change bound variable of a proper substitution into a class. General version of cbvcsbdavw . Deduction form. (Contributed by GG, 14-Aug-2025)
Ref | Expression | ||
---|---|---|---|
Hypotheses | cbvcsbdavw2.1 | ||
cbvcsbdavw2.2 | |||
Assertion | cbvcsbdavw2 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cbvcsbdavw2.1 | ||
2 | cbvcsbdavw2.2 | ||
3 | 2 | eleq2d | |
4 | 1 3 | cbvsbcdavw2 | |
5 | 4 | abbidv | |
6 | df-csb | ||
7 | df-csb | ||
8 | 5 6 7 | 3eqtr4g |