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Theorem 19.41vvv 1915
Description: Theorem 19.41 of [Margaris] p. 90 with 3 quantifiers. (Contributed by NM, 30-Apr-1995.)
Assertion
Ref Expression
19.41vvv  |-  ( E. x E. y E. z ( ph  /\  ps )  <->  ( E. x E. y E. z ph  /\ 
ps ) )
Distinct variable groups:    ps, x    ps, y    ps, z
Allowed substitution hints:    ph( x, y, z)

Proof of Theorem 19.41vvv
StepHypRef Expression
1 19.41vv 1914 . . 3  |-  ( E. y E. z (
ph  /\  ps )  <->  ( E. y E. z ph  /\  ps ) )
21exbii 1589 . 2  |-  ( E. x E. y E. z ( ph  /\  ps )  <->  E. x ( E. y E. z ph  /\ 
ps ) )
3 19.41v 1913 . 2  |-  ( E. x ( E. y E. z ph  /\  ps ) 
<->  ( E. x E. y E. z ph  /\  ps ) )
42, 3bitri 241 1  |-  ( E. x E. y E. z ( ph  /\  ps )  <->  ( E. x E. y E. z ph  /\ 
ps ) )
Colors of variables: wff set class
Syntax hints:    <-> wb 177    /\ wa 359   E.wex 1547
This theorem is referenced by:  19.41vvvv  1916  eloprabga  6101  dftpos3  6435
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1552  ax-5 1563  ax-17 1623  ax-9 1661  ax-8 1682  ax-6 1736  ax-11 1753
This theorem depends on definitions:  df-bi 178  df-an 361  df-ex 1548  df-nf 1551
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