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Theorem csbunig 3802
Description: Distribute proper substitution through the union of a class. (Contributed by Alan Sare, 10-Nov-2012.)
Assertion
Ref Expression
csbunig  |-  ( A  e.  V  ->  [_ A  /  x ]_ U. B  =  U. [_ A  /  x ]_ B )

Proof of Theorem csbunig
Dummy variables  y  z are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 csbabg 3110 . . 3  |-  ( A  e.  V  ->  [_ A  /  x ]_ { z  |  E. y ( z  e.  y  /\  y  e.  B ) }  =  { z  |  [. A  /  x ]. E. y ( z  e.  y  /\  y  e.  B ) } )
2 sbcexg 3009 . . . . 5  |-  ( A  e.  V  ->  ( [. A  /  x ]. E. y ( z  e.  y  /\  y  e.  B )  <->  E. y [. A  /  x ]. ( z  e.  y  /\  y  e.  B
) ) )
3 sbcang 2998 . . . . . . 7  |-  ( A  e.  V  ->  ( [. A  /  x ]. ( z  e.  y  /\  y  e.  B
)  <->  ( [. A  /  x ]. z  e.  y  /\  [. A  /  x ]. y  e.  B ) ) )
4 sbcg 3024 . . . . . . . 8  |-  ( A  e.  V  ->  ( [. A  /  x ]. z  e.  y  <->  z  e.  y ) )
5 sbcel2g 3070 . . . . . . . 8  |-  ( A  e.  V  ->  ( [. A  /  x ]. y  e.  B  <->  y  e.  [_ A  /  x ]_ B ) )
64, 5anbi12d 470 . . . . . . 7  |-  ( A  e.  V  ->  (
( [. A  /  x ]. z  e.  y  /\  [. A  /  x ]. y  e.  B
)  <->  ( z  e.  y  /\  y  e. 
[_ A  /  x ]_ B ) ) )
73, 6bitrd 187 . . . . . 6  |-  ( A  e.  V  ->  ( [. A  /  x ]. ( z  e.  y  /\  y  e.  B
)  <->  ( z  e.  y  /\  y  e. 
[_ A  /  x ]_ B ) ) )
87exbidv 1818 . . . . 5  |-  ( A  e.  V  ->  ( E. y [. A  /  x ]. ( z  e.  y  /\  y  e.  B )  <->  E. y
( z  e.  y  /\  y  e.  [_ A  /  x ]_ B
) ) )
92, 8bitrd 187 . . . 4  |-  ( A  e.  V  ->  ( [. A  /  x ]. E. y ( z  e.  y  /\  y  e.  B )  <->  E. y
( z  e.  y  /\  y  e.  [_ A  /  x ]_ B
) ) )
109abbidv 2288 . . 3  |-  ( A  e.  V  ->  { z  |  [. A  /  x ]. E. y ( z  e.  y  /\  y  e.  B ) }  =  { z  |  E. y ( z  e.  y  /\  y  e.  [_ A  /  x ]_ B ) } )
111, 10eqtrd 2203 . 2  |-  ( A  e.  V  ->  [_ A  /  x ]_ { z  |  E. y ( z  e.  y  /\  y  e.  B ) }  =  { z  |  E. y ( z  e.  y  /\  y  e.  [_ A  /  x ]_ B ) } )
12 df-uni 3795 . . 3  |-  U. B  =  { z  |  E. y ( z  e.  y  /\  y  e.  B ) }
1312csbeq2i 3076 . 2  |-  [_ A  /  x ]_ U. B  =  [_ A  /  x ]_ { z  |  E. y ( z  e.  y  /\  y  e.  B ) }
14 df-uni 3795 . 2  |-  U. [_ A  /  x ]_ B  =  { z  |  E. y ( z  e.  y  /\  y  e. 
[_ A  /  x ]_ B ) }
1511, 13, 143eqtr4g 2228 1  |-  ( A  e.  V  ->  [_ A  /  x ]_ U. B  =  U. [_ A  /  x ]_ B )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    = wceq 1348   E.wex 1485    e. wcel 2141   {cab 2156   [.wsbc 2955   [_csb 3049   U.cuni 3794
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 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-ext 2152
This theorem depends on definitions:  df-bi 116  df-tru 1351  df-nf 1454  df-sb 1756  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-v 2732  df-sbc 2956  df-csb 3050  df-uni 3795
This theorem is referenced by: (None)
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