Theorem cbvrexv2 3112

Description: Rule used to change the bound variable in a restricted existential quantifier with implicit substitution which also changes the quantifier domain. (Contributed by David Moews, 1-May-2017.)

Hypotheses

Ref	Expression
cbvralv2.1	|- ( x = y -> ( ps <-> ch ) )
cbvralv2.2	|- ( x = y -> A = B )

Assertion

Ref	Expression
cbvrexv2	|- ( E. x e. A ps <-> E. y e. B ch )

Distinct variable groups:   y, A   ps, y   x, B   ch, x

Allowed substitution hints:   ps( x)   ch( y)   A( x)   B( y)

Proof of Theorem cbvrexv2

Step	Hyp	Ref	Expression
1		nfcv 2308	. 2 |- F/_ y A
2		nfcv 2308	. 2 |- F/_ x B
3		nfv 1516	. 2 |- F/ y ps
4		nfv 1516	. 2 |- F/ x ch
5		cbvralv2.2	. 2 |- ( x = y -> A = B )
6		cbvralv2.1	. 2 |- ( x = y -> ( ps <-> ch ) )
7	1, 2, 3, 4, 5, 6	cbvrexcsf 3108	1 |- ( E. x e. A ps <-> E. y e. B ch )

Syntax hints:   -> wi 4   <-> wb 104   = wceq 1343   E.wrex 2445

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-rex 2450  df-sbc 2952  df-csb 3046

This theorem is referenced by: (None)