Theorem 19.35ri 1807

Description: Inference associated with 19.35 1805. (Contributed by NM, 12-Mar-1993.)

Hypothesis

Ref	Expression
19.35ri.1	|- ( A. x ph -> E. x ps )

Assertion

Ref	Expression
19.35ri	|- E. x ( ph -> ps )

Proof of Theorem 19.35ri

Step	Hyp	Ref	Expression
1		19.35ri.1	. 2 |- ( A. x ph -> E. x ps )
2		19.35 1805	. 2 |- ( E. x ( ph -> ps ) <-> ( A. x ph -> E. x ps ) )
3	1, 2	mpbir 221	1 |- E. x ( ph -> ps )

Syntax hints:   -> wi 4   A.wal 1481   E.wex 1704

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737

This theorem depends on definitions:  df-bi 197  df-ex 1705

This theorem is referenced by:  qexmid  2063  axrep1  4772  axextnd  9413  axinfnd  9428  bj-axrep1  32788