ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  ralnex Unicode version

Theorem ralnex 2495
Description: Relationship between restricted universal and existential quantifiers. (Contributed by NM, 21-Jan-1997.)
Assertion
Ref Expression
ralnex  |-  ( A. x  e.  A  -.  ph  <->  -. 
E. x  e.  A  ph )

Proof of Theorem ralnex
StepHypRef Expression
1 df-ral 2490 . 2  |-  ( A. x  e.  A  -.  ph  <->  A. x ( x  e.  A  ->  -.  ph )
)
2 alinexa 1627 . . 3  |-  ( A. x ( x  e.  A  ->  -.  ph )  <->  -. 
E. x ( x  e.  A  /\  ph ) )
3 df-rex 2491 . . 3  |-  ( E. x  e.  A  ph  <->  E. x ( x  e.  A  /\  ph )
)
42, 3xchbinxr 685 . 2  |-  ( A. x ( x  e.  A  ->  -.  ph )  <->  -. 
E. x  e.  A  ph )
51, 4bitri 184 1  |-  ( A. x  e.  A  -.  ph  <->  -. 
E. x  e.  A  ph )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 104    <-> wb 105   A.wal 1371   E.wex 1516    e. wcel 2177   A.wral 2485   E.wrex 2486
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 615  ax-in2 616  ax-5 1471  ax-gen 1473  ax-ie2 1518
This theorem depends on definitions:  df-bi 117  df-tru 1376  df-fal 1379  df-ral 2490  df-rex 2491
This theorem is referenced by:  nnral  2497  rexalim  2500  ralinexa  2534  nrex  2599  nrexdv  2600  ralnex2  2646  r19.30dc  2654  uni0b  3884  iindif2m  4004  f0rn0  5487  supmoti  7116  fodjuomnilemdc  7267  ismkvnex  7278  nninfwlpoimlemginf  7299  suprnubex  9056  icc0r  10078  ioo0  10434  ico0  10436  ioc0  10437  prmind2  12527  sqrt2irr  12569  nconstwlpolem  16176
  Copyright terms: Public domain W3C validator