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Theorem 19.2g 1920
Description: Theorem 19.2 of [Margaris] p. 89, generalized to use two setvar variables. Use 19.2 1799 when sufficient. (Contributed by Mel L. 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 1909 . 2  |-  ( ph  ->  E. y ph )
21sps 1917 1  |-  ( A. x ph  ->  E. y ph )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4   A.wal 1436   E.wex 1660
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1666  ax-4 1679  ax-5 1749  ax-6 1795  ax-7 1840  ax-12 1906
This theorem depends on definitions:  df-bi 189  df-ex 1661
This theorem is referenced by: (None)
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