Description: Rule used to change the bound variable in a restricted universal quantifier with implicit substitution. Deduction form. (Contributed by David Moews, 1-May-2017) Avoid ax-9 , ax-ext . (Revised by Wolf Lammen, 9-Mar-2025)
Ref | Expression | ||
---|---|---|---|
Hypothesis | cbvraldva.1 | ||
Assertion | cbvraldva |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cbvraldva.1 | ||
2 | 1 | ancoms | |
3 | 2 | pm5.74da | |
4 | 3 | cbvralvw | |
5 | r19.21v | ||
6 | r19.21v | ||
7 | 4 5 6 | 3bitr3i | |
8 | 7 | pm5.74ri |