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Theorem alsyl 1526
Description: Theorem *10.3 in [WhiteheadRussell] p. 150. (Contributed by Andrew Salmon, 8-Jun-2011.)
Assertion
Ref Expression
alsyl  |-  ( ( A. x ( ph  ->  ps )  /\  A. x ( ps  ->  ch ) )  ->  A. x
( ph  ->  ch )
)

Proof of Theorem alsyl
StepHypRef Expression
1 pm3.33 327 . 2  |-  ( ( ( ph  ->  ps )  /\  ( ps  ->  ch ) )  ->  ( ph  ->  ch ) )
21alanimi 1348 1  |-  ( ( A. x ( ph  ->  ps )  /\  A. x ( ps  ->  ch ) )  ->  A. x
( ph  ->  ch )
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 97   A.wal 1241
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-5 1336  ax-gen 1338
This theorem is referenced by:  barbara  1998
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