Theorem nexr 1582

Description: Inference from 19.8a 1482. (Contributed by Jeff Hankins, 26-Jul-2009.)

Hypothesis

Ref	Expression
nexr.1	|- -. E. x ph

Assertion

Ref	Expression
nexr	|- -. ph

Proof of Theorem nexr

Step	Hyp	Ref	Expression
1		nexr.1	. 2 |- -. E. x ph
2		19.8a 1482	. 2 |- ( ph -> E. x ph )
3	1, 2	mto 588	1 |- -. ph

Syntax hints:   -. wn 3   E.wex 1381

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-in1 544  ax-in2 545  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-4 1400

This theorem depends on definitions:  df-bi 110

This theorem is referenced by: (None)