Theorem ceqsexv 2842

Description: Elimination of an existential quantifier, using implicit substitution. (Contributed by NM, 2-Mar-1995.)

Hypotheses

Ref	Expression
ceqsexv.1	|- A e. _V
ceqsexv.2	|- ( x = A -> ( ph <-> ps ) )

Assertion

Ref	Expression
ceqsexv	|- ( E. x ( x = A /\ ph ) <-> ps )

Distinct variable groups:   x, A   ps, x

Allowed substitution hint:   ph( x)

Proof of Theorem ceqsexv

Step	Hyp	Ref	Expression
1		nfv 1576	. 2 |- F/ x ps
2		ceqsexv.1	. 2 |- A e. _V
3		ceqsexv.2	. 2 |- ( x = A -> ( ph <-> ps ) )
4	1, 2, 3	ceqsex 2841	1 |- ( E. x ( x = A /\ ph ) <-> ps )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   = wceq 1397   E.wex 1540   e. wcel 2202   _Vcvv 2802

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 1495  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-ext 2213

This theorem depends on definitions:  df-bi 117  df-nf 1509  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-v 2804

This theorem is referenced by:  ceqsex3v  2846  gencbvex  2850  sbhypf  2853  euxfr2dc  2991  inuni  4245  eqvinop  4335  onm  4498  uniuni  4548  opeliunxp  4781  elvvv  4789  rexiunxp  4872  imai  5092  coi1  5252  abrexco  5899  opabex3d  6282  opabex3  6283  mapsnen  6985  xpsnen  7004  xpcomco  7009  xpassen  7013