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Theorem cdleme31se 36524
Description: Part of proof of Lemma D in [Crawley] p. 113. (Contributed by NM, 26-Feb-2013.)
Hypotheses
Ref Expression
cdleme31se.e  |-  E  =  ( ( P  .\/  Q )  ./\  ( D  .\/  ( ( s  .\/  T )  ./\  W )
) )
cdleme31se.y  |-  Y  =  ( ( P  .\/  Q )  ./\  ( D  .\/  ( ( R  .\/  T )  ./\  W )
) )
Assertion
Ref Expression
cdleme31se  |-  ( R  e.  A  ->  [_ R  /  s ]_ E  =  Y )
Distinct variable groups:    A, s    D, s    .\/ , s    ./\ , s    P, s    Q, s    R, s    W, s    T, s
Allowed substitution hints:    E( s)    Y( s)

Proof of Theorem cdleme31se
StepHypRef Expression
1 nfcvd 2617 . . 3  |-  ( R  e.  A  ->  F/_ s
( ( P  .\/  Q )  ./\  ( D  .\/  ( ( R  .\/  T )  ./\  W )
) ) )
2 oveq1 6277 . . . . . 6  |-  ( s  =  R  ->  (
s  .\/  T )  =  ( R  .\/  T ) )
32oveq1d 6285 . . . . 5  |-  ( s  =  R  ->  (
( s  .\/  T
)  ./\  W )  =  ( ( R 
.\/  T )  ./\  W ) )
43oveq2d 6286 . . . 4  |-  ( s  =  R  ->  ( D  .\/  ( ( s 
.\/  T )  ./\  W ) )  =  ( D  .\/  ( ( R  .\/  T ) 
./\  W ) ) )
54oveq2d 6286 . . 3  |-  ( s  =  R  ->  (
( P  .\/  Q
)  ./\  ( D  .\/  ( ( s  .\/  T )  ./\  W )
) )  =  ( ( P  .\/  Q
)  ./\  ( D  .\/  ( ( R  .\/  T )  ./\  W )
) ) )
61, 5csbiegf 3444 . 2  |-  ( R  e.  A  ->  [_ R  /  s ]_ (
( P  .\/  Q
)  ./\  ( D  .\/  ( ( s  .\/  T )  ./\  W )
) )  =  ( ( P  .\/  Q
)  ./\  ( D  .\/  ( ( R  .\/  T )  ./\  W )
) ) )
7 cdleme31se.e . . 3  |-  E  =  ( ( P  .\/  Q )  ./\  ( D  .\/  ( ( s  .\/  T )  ./\  W )
) )
87csbeq2i 3832 . 2  |-  [_ R  /  s ]_ E  =  [_ R  /  s ]_ ( ( P  .\/  Q )  ./\  ( D  .\/  ( ( s  .\/  T )  ./\  W )
) )
9 cdleme31se.y . 2  |-  Y  =  ( ( P  .\/  Q )  ./\  ( D  .\/  ( ( R  .\/  T )  ./\  W )
) )
106, 8, 93eqtr4g 2520 1  |-  ( R  e.  A  ->  [_ R  /  s ]_ E  =  Y )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    = wceq 1398    e. wcel 1823   [_csb 3420  (class class class)co 6270
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1623  ax-4 1636  ax-5 1709  ax-6 1752  ax-7 1795  ax-10 1842  ax-11 1847  ax-12 1859  ax-13 2004  ax-ext 2432
This theorem depends on definitions:  df-bi 185  df-or 368  df-an 369  df-3an 973  df-tru 1401  df-ex 1618  df-nf 1622  df-sb 1745  df-clab 2440  df-cleq 2446  df-clel 2449  df-nfc 2604  df-rex 2810  df-rab 2813  df-v 3108  df-sbc 3325  df-csb 3421  df-dif 3464  df-un 3466  df-in 3468  df-ss 3475  df-nul 3784  df-if 3930  df-sn 4017  df-pr 4019  df-op 4023  df-uni 4236  df-br 4440  df-iota 5534  df-fv 5578  df-ov 6273
This theorem is referenced by:  cdleme31sde  36527  cdleme31sn1c  36530
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