Theorem nrex 2634

Description: Inference adding restricted existential quantifier to negated wff. (Contributed by NM, 16-Oct-2003.)

Hypothesis

Ref	Expression
nrex.1	|- ( x e. A -> -. ps )

Assertion

Ref	Expression
nrex	|- -. E. x e. A ps

Proof of Theorem nrex

Step	Hyp	Ref	Expression
1		nrex.1	. . 3 |- ( x e. A -> -. ps )
2	1	rgen 2595	. 2 |- A. x e. A -. ps
3		ralnex 2530	. 2 |- ( A. x e. A -. ps <-> -. E. x e. A ps )
4	2, 3	mpbi 145	1 |- -. E. x e. A ps

Syntax hints:   -. wn 3   -> wi 4   e. wcel 2203   A.wral 2520   E.wrex 2521

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-in1 619  ax-in2 620  ax-5 1496  ax-gen 1498  ax-ie2 1543

This theorem depends on definitions:  df-bi 117  df-tru 1401  df-fal 1404  df-ral 2525  df-rex 2526

This theorem is referenced by:  rex0  3526  iun0  4048  canth  6001  frec0g  6628  nominpos  9476  sqrt2irr  12859  gsum0g  13609  exmidsbthrlem  16802