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Theorem bnj23 28817
Description: First-order logic and set theory. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) (Proof shortened by Mario Carneiro, 22-Dec-2016.) (New usage is discouraged.)
Hypothesis
Ref Expression
bnj23.1  |-  B  =  { x  e.  A  |  -.  ph }
Assertion
Ref Expression
bnj23  |-  ( A. z  e.  B  -.  z R y  ->  A. w  e.  A  ( w R y  ->  [. w  /  x ]. ph )
)
Distinct variable groups:    x, A    y, A, z    w, B, y, z    w, R, y, z
Allowed substitution hints:    ph( x, y, z, w)    A( w)    B( x)    R( x)

Proof of Theorem bnj23
StepHypRef Expression
1 vex 2793 . . . . 5  |-  w  e. 
_V
2 sbcng 3033 . . . . 5  |-  ( w  e.  _V  ->  ( [. w  /  x ].  -.  ph  <->  -.  [. w  /  x ]. ph ) )
31, 2ax-mp 8 . . . 4  |-  ( [. w  /  x ].  -.  ph  <->  -. 
[. w  /  x ]. ph )
4 bnj23.1 . . . . . . . 8  |-  B  =  { x  e.  A  |  -.  ph }
54eleq2i 2349 . . . . . . 7  |-  ( w  e.  B  <->  w  e.  { x  e.  A  |  -.  ph } )
6 nfcv 2421 . . . . . . . 8  |-  F/_ x A
76elrabsf 3031 . . . . . . 7  |-  ( w  e.  { x  e.  A  |  -.  ph } 
<->  ( w  e.  A  /\  [. w  /  x ].  -.  ph ) )
85, 7bitri 240 . . . . . 6  |-  ( w  e.  B  <->  ( w  e.  A  /\  [. w  /  x ].  -.  ph ) )
9 breq1 4028 . . . . . . . 8  |-  ( z  =  w  ->  (
z R y  <->  w R
y ) )
109notbid 285 . . . . . . 7  |-  ( z  =  w  ->  ( -.  z R y  <->  -.  w R y ) )
1110rspccv 2883 . . . . . 6  |-  ( A. z  e.  B  -.  z R y  ->  (
w  e.  B  ->  -.  w R y ) )
128, 11syl5bir 209 . . . . 5  |-  ( A. z  e.  B  -.  z R y  ->  (
( w  e.  A  /\  [. w  /  x ].  -.  ph )  ->  -.  w R y ) )
1312expdimp 426 . . . 4  |-  ( ( A. z  e.  B  -.  z R y  /\  w  e.  A )  ->  ( [. w  /  x ].  -.  ph  ->  -.  w R y ) )
143, 13syl5bir 209 . . 3  |-  ( ( A. z  e.  B  -.  z R y  /\  w  e.  A )  ->  ( -.  [. w  /  x ]. ph  ->  -.  w R y ) )
1514con4d 97 . 2  |-  ( ( A. z  e.  B  -.  z R y  /\  w  e.  A )  ->  ( w R y  ->  [. w  /  x ]. ph ) )
1615ralrimiva 2628 1  |-  ( A. z  e.  B  -.  z R y  ->  A. w  e.  A  ( w R y  ->  [. w  /  x ]. ph )
)
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    <-> wb 176    /\ wa 358    = wceq 1625    e. wcel 1686   A.wral 2545   {crab 2549   _Vcvv 2790   [.wsbc 2993   class class class wbr 4025
This theorem is referenced by:  bnj110  28963
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1535  ax-5 1546  ax-17 1605  ax-9 1637  ax-8 1645  ax-6 1705  ax-7 1710  ax-11 1717  ax-12 1868  ax-ext 2266
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-tru 1310  df-ex 1531  df-nf 1534  df-sb 1632  df-clab 2272  df-cleq 2278  df-clel 2281  df-nfc 2410  df-ral 2550  df-rab 2554  df-v 2792  df-sbc 2994  df-dif 3157  df-un 3159  df-in 3161  df-ss 3168  df-nul 3458  df-if 3568  df-sn 3648  df-pr 3649  df-op 3651  df-br 4026
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