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Theorem reean 2645
Description: Rearrange existential quantifiers. (Contributed by NM, 27-Oct-2010.) (Proof shortened by Andrew Salmon, 30-May-2011.)
Hypotheses
Ref Expression
reean.1  |-  F/ y
ph
reean.2  |-  F/ x ps
Assertion
Ref Expression
reean  |-  ( E. x  e.  A  E. y  e.  B  ( ph  /\  ps )  <->  ( E. x  e.  A  ph  /\  E. y  e.  B  ps ) )
Distinct variable groups:    y, A    x, B    x, y
Allowed substitution hints:    ph( x, y)    ps( x, y)    A( x)    B( y)

Proof of Theorem reean
StepHypRef Expression
1 an4 586 . . . 4  |-  ( ( ( x  e.  A  /\  y  e.  B
)  /\  ( ph  /\ 
ps ) )  <->  ( (
x  e.  A  /\  ph )  /\  ( y  e.  B  /\  ps ) ) )
212exbii 1606 . . 3  |-  ( E. x E. y ( ( x  e.  A  /\  y  e.  B
)  /\  ( ph  /\ 
ps ) )  <->  E. x E. y ( ( x  e.  A  /\  ph )  /\  ( y  e.  B  /\  ps )
) )
3 nfv 1528 . . . . 5  |-  F/ y  x  e.  A
4 reean.1 . . . . 5  |-  F/ y
ph
53, 4nfan 1565 . . . 4  |-  F/ y ( x  e.  A  /\  ph )
6 nfv 1528 . . . . 5  |-  F/ x  y  e.  B
7 reean.2 . . . . 5  |-  F/ x ps
86, 7nfan 1565 . . . 4  |-  F/ x
( y  e.  B  /\  ps )
95, 8eean 1931 . . 3  |-  ( E. x E. y ( ( x  e.  A  /\  ph )  /\  (
y  e.  B  /\  ps ) )  <->  ( E. x ( x  e.  A  /\  ph )  /\  E. y ( y  e.  B  /\  ps ) ) )
102, 9bitri 184 . 2  |-  ( E. x E. y ( ( x  e.  A  /\  y  e.  B
)  /\  ( ph  /\ 
ps ) )  <->  ( E. x ( x  e.  A  /\  ph )  /\  E. y ( y  e.  B  /\  ps ) ) )
11 r2ex 2497 . 2  |-  ( E. x  e.  A  E. y  e.  B  ( ph  /\  ps )  <->  E. x E. y ( ( x  e.  A  /\  y  e.  B )  /\  ( ph  /\  ps ) ) )
12 df-rex 2461 . . 3  |-  ( E. x  e.  A  ph  <->  E. x ( x  e.  A  /\  ph )
)
13 df-rex 2461 . . 3  |-  ( E. y  e.  B  ps  <->  E. y ( y  e.  B  /\  ps )
)
1412, 13anbi12i 460 . 2  |-  ( ( E. x  e.  A  ph 
/\  E. y  e.  B  ps )  <->  ( E. x
( x  e.  A  /\  ph )  /\  E. y ( y  e.  B  /\  ps )
) )
1510, 11, 143bitr4i 212 1  |-  ( E. x  e.  A  E. y  e.  B  ( ph  /\  ps )  <->  ( E. x  e.  A  ph  /\  E. y  e.  B  ps ) )
Colors of variables: wff set class
Syntax hints:    /\ wa 104    <-> wb 105   F/wnf 1460   E.wex 1492    e. wcel 2148   E.wrex 2456
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 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-ext 2159
This theorem depends on definitions:  df-bi 117  df-nf 1461  df-sb 1763  df-cleq 2170  df-clel 2173  df-nfc 2308  df-rex 2461
This theorem is referenced by:  reeanv  2646
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