Theorem 19.29x 1637

Description: Variation of Theorem 19.29 of [Margaris] p. 90 with mixed quantification. (Contributed by NM, 11-Feb-2005.)

Assertion

Ref	Expression
19.29x	|- ( ( E. x A. y ph /\ A. x E. y ps ) -> E. x E. y ( ph /\ ps ) )

Proof of Theorem 19.29x

Step	Hyp	Ref	Expression
1		19.29r 1635	. 2 |- ( ( E. x A. y ph /\ A. x E. y ps ) -> E. x ( A. y ph /\ E. y ps ) )
2		19.29 1634	. . 3 |- ( ( A. y ph /\ E. y ps ) -> E. y ( ph /\ ps ) )
3	2	eximi 1614	. 2 |- ( E. x ( A. y ph /\ E. y ps ) -> E. x E. y ( ph /\ ps ) )
4	1, 3	syl 14	1 |- ( ( E. x A. y ph /\ A. x E. y ps ) -> E. x E. y ( ph /\ ps ) )

Syntax hints:   -> wi 4   /\ wa 104   A.wal 1362   E.wex 1506

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1461  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-4 1524  ax-ial 1548

This theorem depends on definitions:  df-bi 117

This theorem is referenced by: (None)