Theorem cbviinv 3853

Description: Change bound variables in an indexed intersection. (Contributed by Jeff Hankins, 26-Aug-2009.)

Hypothesis

Ref	Expression
cbviunv.1	|- ( x = y -> B = C )

Assertion

Ref	Expression
cbviinv	|- |^|_ x e. A B = |^|_ y e. A C

Distinct variable groups:   x, A   y, A   y, B   x, C

Allowed substitution hints:   B( x)   C( y)

Proof of Theorem cbviinv

Step	Hyp	Ref	Expression
1		nfcv 2281	. 2 |- F/_ y B
2		nfcv 2281	. 2 |- F/_ x C
3		cbviunv.1	. 2 |- ( x = y -> B = C )
4	1, 2, 3	cbviin 3851	1 |- |^|_ x e. A B = |^|_ y e. A C

Syntax hints:   -> wi 4   = wceq 1331   |^|_ciin 3814

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2121

This theorem depends on definitions:  df-bi 116  df-tru 1334  df-nf 1437  df-sb 1736  df-clab 2126  df-cleq 2132  df-clel 2135  df-nfc 2270  df-ral 2421  df-iin 3816

This theorem is referenced by: (None)