Description: Change bound variable in an integral. (Contributed by Mario Carneiro, 28-Jun-2014)
Ref | Expression | ||
---|---|---|---|
Hypothesis | cbvitg.1 | |- ( x = y -> B = C ) |
|
Assertion | cbvitgv | |- S. A B _d x = S. A C _d y |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cbvitg.1 | |- ( x = y -> B = C ) |
|
2 | nfcv | |- F/_ y B |
|
3 | nfcv | |- F/_ x C |
|
4 | 1 2 3 | cbvitg | |- S. A B _d x = S. A C _d y |