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Theorem cbvral2v 2742
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 2497 . . 3  |-  ( x  =  z  ->  ( A. y  e.  B  ph  <->  A. y  e.  B  ch ) )
32cbvralv 2729 . 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 2729 . . 3  |-  ( A. y  e.  B  ch  <->  A. w  e.  B  ps )
65ralbii 2503 . 2  |-  ( A. z  e.  A  A. y  e.  B  ch  <->  A. z  e.  A  A. w  e.  B  ps )
73, 6bitri 184 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 105   A.wral 2475
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-ext 2178
This theorem depends on definitions:  df-bi 117  df-tru 1367  df-nf 1475  df-sb 1777  df-cleq 2189  df-clel 2192  df-nfc 2328  df-ral 2480
This theorem is referenced by:  cbvral3v  2744  fununi  5326  fiintim  6992  isoti  7073  nninfwlpoim  7244  cauappcvgprlemlim  7728  caucvgprlemnkj  7733  caucvgprlemcl  7743  caucvgprprlemcbv  7754  axcaucvglemcau  7965  axpre-suploc  7969  seqvalcd  10553  seqovcd  10559  seq3distr  10624  fprodcl2lem  11770  ennnfonelemr  12640  ctinf  12647  ercpbl  12974  grppropd  13149
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