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Theorem cbvral2v 2660
Description: Change bound variables of double restricted universal quantification, using implicit substitution. (Contributed by NM, 10-Aug-2004.)
Hypotheses
Ref Expression
cbvral2v.1  |-  ( x  =  z  ->  ( ph 
<->  ch ) )
cbvral2v.2  |-  ( y  =  w  ->  ( ch 
<->  ps ) )
Assertion
Ref Expression
cbvral2v  |-  ( A. x  e.  A  A. y  e.  B  ph  <->  A. z  e.  A  A. w  e.  B  ps )
Distinct variable groups:    x, A    z, A    x, y, B    y,
z, B    w, B    ph, z    ps, y    ch, x    ch, w
Allowed substitution hints:    ph( x, y, w)    ps( x, z, w)    ch( y, z)    A( y, w)

Proof of Theorem cbvral2v
StepHypRef Expression
1 cbvral2v.1 . . . 4  |-  ( x  =  z  ->  ( ph 
<->  ch ) )
21ralbidv 2435 . . 3  |-  ( x  =  z  ->  ( A. y  e.  B  ph  <->  A. y  e.  B  ch ) )
32cbvralv 2652 . 2  |-  ( A. x  e.  A  A. y  e.  B  ph  <->  A. z  e.  A  A. y  e.  B  ch )
4 cbvral2v.2 . . . 4  |-  ( y  =  w  ->  ( ch 
<->  ps ) )
54cbvralv 2652 . . 3  |-  ( A. y  e.  B  ch  <->  A. w  e.  B  ps )
65ralbii 2439 . 2  |-  ( A. z  e.  A  A. y  e.  B  ch  <->  A. z  e.  A  A. w  e.  B  ps )
73, 6bitri 183 1  |-  ( A. x  e.  A  A. y  e.  B  ph  <->  A. z  e.  A  A. w  e.  B  ps )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 104   A.wral 2414
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 2119
This theorem depends on definitions:  df-bi 116  df-tru 1334  df-nf 1437  df-sb 1736  df-cleq 2130  df-clel 2133  df-nfc 2268  df-ral 2419
This theorem is referenced by:  cbvral3v  2662  fununi  5186  fiintim  6810  isoti  6887  cauappcvgprlemlim  7462  caucvgprlemnkj  7467  caucvgprlemcl  7477  caucvgprprlemcbv  7488  axcaucvglemcau  7699  axpre-suploc  7703  seqvalcd  10225  seqovcd  10229  seq3distr  10279  ennnfonelemr  11925  ctinf  11932
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