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

Theorem dvelimf 1990
Description: Version of dvelim 1992 without any variable restrictions. (Contributed by NM, 1-Oct-2002.)
Hypotheses
Ref Expression
dvelimf.1  |-  ( ph  ->  A. x ph )
dvelimf.2  |-  ( ps 
->  A. z ps )
dvelimf.3  |-  ( z  =  y  ->  ( ph 
<->  ps ) )
Assertion
Ref Expression
dvelimf  |-  ( -. 
A. x  x  =  y  ->  ( ps  ->  A. x ps )
)

Proof of Theorem dvelimf
StepHypRef Expression
1 dvelimf.1 . . 3  |-  ( ph  ->  A. x ph )
21hbsb4 1987 . 2  |-  ( -. 
A. x  x  =  y  ->  ( [
y  /  z ]
ph  ->  A. x [ y  /  z ] ph ) )
3 dvelimf.2 . . 3  |-  ( ps 
->  A. z ps )
4 dvelimf.3 . . 3  |-  ( z  =  y  ->  ( ph 
<->  ps ) )
53, 4sbieh 1763 . 2  |-  ( [ y  /  z ]
ph 
<->  ps )
65albii 1446 . 2  |-  ( A. x [ y  /  z ] ph  <->  A. x ps )
72, 5, 63imtr3g 203 1  |-  ( -. 
A. x  x  =  y  ->  ( ps  ->  A. x ps )
)
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    <-> wb 104   A.wal 1329   [wsb 1735
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-in2 604  ax-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515
This theorem depends on definitions:  df-bi 116  df-nf 1437  df-sb 1736
This theorem is referenced by:  dvelim  1992  dveel1  1995  dveel2  1996
  Copyright terms: Public domain W3C validator