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Theorem ex-natded9.26-2 20795
Description: A more efficient proof of Theorem 9.26 of [Laboreo] p. 45. Compare with ex-natded9.26 20794. (Contributed by Mario Carneiro, 9-Feb-2017.)
Hypothesis
Ref Expression
ex-natded9.26.1  |-  ( ph  ->  E. x A. y ps )
Assertion
Ref Expression
ex-natded9.26-2  |-  ( ph  ->  A. y E. x ps )
Distinct variable group:    x, y,
ph
Allowed substitution hints:    ps( x, y)

Proof of Theorem ex-natded9.26-2
StepHypRef Expression
1 ex-natded9.26.1 . . 3  |-  ( ph  ->  E. x A. y ps )
2 ax-4 1692 . . . 4  |-  ( A. y ps  ->  ps )
32eximi 1574 . . 3  |-  ( E. x A. y ps 
->  E. x ps )
41, 3syl 17 . 2  |-  ( ph  ->  E. x ps )
54alrimiv 2013 1  |-  ( ph  ->  A. y E. x ps )
Colors of variables: wff set class
Syntax hints:    -> wi 6   A.wal 1532   E.wex 1537
This theorem was proved from axioms:  ax-1 7  ax-2 8  ax-3 9  ax-mp 10  ax-5 1533  ax-gen 1536  ax-17 1628  ax-4 1692
This theorem depends on definitions:  df-bi 179  df-ex 1538  df-nf 1540
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