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Theorem pm11.12 27486
Description: Theorem *11.12 in [WhiteheadRussell] p. 159. (Contributed by Andrew Salmon, 17-Jun-2011.)
Assertion
Ref Expression
pm11.12  |-  ( A. x A. y ( ph  \/  ps )  ->  ( ph  \/  A. x A. y ps ) )
Distinct variable groups:    ph, x    ph, y
Allowed substitution hints:    ps( x, y)

Proof of Theorem pm11.12
StepHypRef Expression
1 pm10.12 27468 . . 3  |-  ( A. y ( ph  \/  ps )  ->  ( ph  \/  A. y ps )
)
21alimi 1568 . 2  |-  ( A. x A. y ( ph  \/  ps )  ->  A. x
( ph  \/  A. y ps ) )
3 pm10.12 27468 . 2  |-  ( A. x ( ph  \/  A. y ps )  -> 
( ph  \/  A. x A. y ps ) )
42, 3syl 16 1  |-  ( A. x A. y ( ph  \/  ps )  ->  ( ph  \/  A. x A. y ps ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    \/ wo 358   A.wal 1549
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1555  ax-5 1566  ax-17 1626  ax-9 1666  ax-8 1687  ax-6 1744  ax-11 1761
This theorem depends on definitions:  df-bi 178  df-or 360  df-tru 1328  df-ex 1551  df-nf 1554
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