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Theorem iinconstm 3910
Description: Indexed intersection of a constant class, i.e. where  B does not depend on  x. (Contributed by Jim Kingdon, 19-Dec-2018.)
Assertion
Ref Expression
iinconstm  |-  ( E. y  y  e.  A  -> 
|^|_ x  e.  A  B  =  B )
Distinct variable groups:    x, A    x, B    y, A
Allowed substitution hint:    B( y)

Proof of Theorem iinconstm
Dummy variable  z is distinct from all other variables.
StepHypRef Expression
1 vex 2755 . . . 4  |-  z  e. 
_V
2 eliin 3906 . . . 4  |-  ( z  e.  _V  ->  (
z  e.  |^|_ x  e.  A  B  <->  A. x  e.  A  z  e.  B ) )
31, 2ax-mp 5 . . 3  |-  ( z  e.  |^|_ x  e.  A  B 
<-> 
A. x  e.  A  z  e.  B )
4 r19.3rmv 3528 . . 3  |-  ( E. y  y  e.  A  ->  ( z  e.  B  <->  A. x  e.  A  z  e.  B ) )
53, 4bitr4id 199 . 2  |-  ( E. y  y  e.  A  ->  ( z  e.  |^|_ x  e.  A  B  <->  z  e.  B ) )
65eqrdv 2187 1  |-  ( E. y  y  e.  A  -> 
|^|_ x  e.  A  B  =  B )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 105    = wceq 1364   E.wex 1503    e. wcel 2160   A.wral 2468   _Vcvv 2752   |^|_ciin 3902
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 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-ext 2171
This theorem depends on definitions:  df-bi 117  df-tru 1367  df-nf 1472  df-sb 1774  df-clab 2176  df-cleq 2182  df-clel 2185  df-nfc 2321  df-ral 2473  df-v 2754  df-iin 3904
This theorem is referenced by:  iin0imm  4183
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