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Theorem 19.2g 1792
Description: Theorem 19.2 of [Margaris] p. 89, generalized to use two set variables. (Contributed by O'Cat, 31-Mar-2008.)
Assertion
Ref Expression
19.2g  |-  ( A. x ph  ->  E. y ph )

Proof of Theorem 19.2g
StepHypRef Expression
1 19.8a 1730 . 2  |-  ( ph  ->  E. y ph )
21sps 1751 1  |-  ( A. x ph  ->  E. y ph )
Colors of variables: wff set class
Syntax hints:    -> wi 4   A.wal 1530   E.wex 1531
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1536  ax-5 1547  ax-17 1606  ax-9 1644  ax-8 1661  ax-11 1727
This theorem depends on definitions:  df-bi 177  df-ex 1532
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