Theorem 19.42v 1878

Description: Special case of Theorem 19.42 of [Margaris] p. 90. (Contributed by NM, 5-Aug-1993.)

Assertion

Ref	Expression
19.42v	|- ( E. x ( ph /\ ps ) <-> ( ph /\ E. x ps ) )

Distinct variable group:   ph, x

Allowed substitution hint:   ps( x)

Proof of Theorem 19.42v

Step	Hyp	Ref	Expression
1		ax-17 1506	. 2 |- ( ph -> A. x ph )
2	1	19.42h 1665	1 |- ( E. x ( ph /\ ps ) <-> ( ph /\ E. x ps ) )

Syntax hints:   /\ wa 103   <-> wb 104   E.wex 1468

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-5 1423  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-4 1487  ax-17 1506  ax-ial 1514

This theorem depends on definitions:  df-bi 116

This theorem is referenced by:  exdistr  1881  19.42vv  1883  19.42vvv  1884  4exdistr  1888  cbvex2  1894  2sb5  1958  2sb5rf  1964  rexcom4a  2710  ceqsex2  2726  reuind  2889  2rmorex  2890  sbccomlem  2983  bm1.3ii  4049  opm  4156  eqvinop  4165  uniuni  4372  elco  4705  dmopabss  4751  dmopab3  4752  mptpreima  5032  brprcneu  5414  relelfvdm  5453  fndmin  5527  fliftf  5700  dfoprab2  5818  dmoprab  5852  dmoprabss  5853  fnoprabg  5872  opabex3d  6019  opabex3  6020  eroveu  6520  dmaddpq  7187  dmmulpq  7188  prarloc  7311  ltexprlemopl  7409  ltexprlemlol  7410  ltexprlemopu  7411  ltexprlemupu  7412  shftdm  10594  ntreq0  12301  bdbm1.3ii  13089