Description: Change bound variables to isolate them later. (Contributed by NM, 3-Nov-2013)
Ref | Expression | ||
---|---|---|---|
Hypothesis | dvhvaddval.a | |
|
Assertion | dvhvaddcbv | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dvhvaddval.a | |
|
2 | fveq2 | |
|
3 | 2 | coeq1d | |
4 | fveq2 | |
|
5 | 4 | oveq1d | |
6 | 3 5 | opeq12d | |
7 | fveq2 | |
|
8 | 7 | coeq2d | |
9 | fveq2 | |
|
10 | 9 | oveq2d | |
11 | 8 10 | opeq12d | |
12 | 6 11 | cbvmpov | |
13 | 1 12 | eqtri | |