Theorem cbvcsbv 3051

Description: Change the bound variable of a proper substitution into a class using implicit substitution. (Contributed by NM, 30-Sep-2008.) (Revised by Mario Carneiro, 13-Oct-2016.)

Hypothesis

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

Assertion

Ref	Expression
cbvcsbv	|- [_ A / x ]_ B = [_ A / y ]_ C

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

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

Proof of Theorem cbvcsbv

Step	Hyp	Ref	Expression
1		nfcv 2308	. 2 |- F/_ y B
2		nfcv 2308	. 2 |- F/_ x C
3		cbvcsbv.1	. 2 |- ( x = y -> B = C )
4	1, 2, 3	cbvcsb 3050	1 |- [_ A / x ]_ B = [_ A / y ]_ C

Syntax hints:   -> wi 4   = wceq 1343   [_csb 3045

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 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-ext 2147

This theorem depends on definitions:  df-bi 116  df-tru 1346  df-nf 1449  df-sb 1751  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-sbc 2952  df-csb 3046

This theorem is referenced by: (None)