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Theorem sbcralg 3078
Description: Interchange class substitution and restricted quantifier. (Contributed by NM, 15-Nov-2005.) (Proof shortened by Andrew Salmon, 29-Jun-2011.)
Assertion
Ref Expression
sbcralg  |-  ( A  e.  V  ->  ( [. A  /  x ]. A. y  e.  B  ph  <->  A. y  e.  B  [. A  /  x ]. ph )
)
Distinct variable groups:    y, A    x, B    x, y
Allowed substitution hints:    ph( x, y)    A( x)    B( y)    V( x, y)

Proof of Theorem sbcralg
Dummy variable  z is distinct from all other variables.
StepHypRef Expression
1 dfsbcq2 3007 . 2  |-  ( z  =  A  ->  ( [ z  /  x ] A. y  e.  B  ph  <->  [. A  /  x ]. A. y  e.  B  ph ) )
2 dfsbcq2 3007 . . 3  |-  ( z  =  A  ->  ( [ z  /  x ] ph  <->  [. A  /  x ]. ph ) )
32ralbidv 2576 . 2  |-  ( z  =  A  ->  ( A. y  e.  B  [ z  /  x ] ph  <->  A. y  e.  B  [. A  /  x ]. ph ) )
4 nfcv 2432 . . . 4  |-  F/_ x B
5 nfs1v 2058 . . . 4  |-  F/ x [ z  /  x ] ph
64, 5nfral 2609 . . 3  |-  F/ x A. y  e.  B  [ z  /  x ] ph
7 sbequ12 1872 . . . 4  |-  ( x  =  z  ->  ( ph 
<->  [ z  /  x ] ph ) )
87ralbidv 2576 . . 3  |-  ( x  =  z  ->  ( A. y  e.  B  ph  <->  A. y  e.  B  [
z  /  x ] ph ) )
96, 8sbie 1991 . 2  |-  ( [ z  /  x ] A. y  e.  B  ph  <->  A. y  e.  B  [
z  /  x ] ph )
101, 3, 9vtoclbg 2857 1  |-  ( A  e.  V  ->  ( [. A  /  x ]. A. y  e.  B  ph  <->  A. y  e.  B  [. A  /  x ]. ph )
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 176    = wceq 1632   [wsb 1638    e. wcel 1696   A.wral 2556   [.wsbc 3004
This theorem is referenced by:  r19.12sn  3709  rspsbc2  28596  rspsbc2VD  28947  cdlemkid3N  31744  cdlemkid4  31745
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1536  ax-5 1547  ax-17 1606  ax-9 1644  ax-8 1661  ax-6 1715  ax-7 1720  ax-11 1727  ax-12 1878  ax-ext 2277
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-tru 1310  df-ex 1532  df-nf 1535  df-sb 1639  df-clab 2283  df-cleq 2289  df-clel 2292  df-nfc 2421  df-ral 2561  df-v 2803  df-sbc 3005
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