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

Theorem abexssex 6016
Description: Existence of a class abstraction with an existentially quantified expression. Both  x and  y can be free in  ph. (Contributed by NM, 29-Jul-2006.)
Hypotheses
Ref Expression
abrexex2.1  |-  A  e. 
_V
abrexex2.2  |-  { y  |  ph }  e.  _V
Assertion
Ref Expression
abexssex  |-  { y  |  E. x ( x  C_  A  /\  ph ) }  e.  _V
Distinct variable group:    x, y, A
Allowed substitution hints:    ph( x, y)

Proof of Theorem abexssex
StepHypRef Expression
1 df-rex 2420 . . . 4  |-  ( E. x  e.  ~P  A ph 
<->  E. x ( x  e.  ~P A  /\  ph ) )
2 velpw 3512 . . . . . 6  |-  ( x  e.  ~P A  <->  x  C_  A
)
32anbi1i 453 . . . . 5  |-  ( ( x  e.  ~P A  /\  ph )  <->  ( x  C_  A  /\  ph )
)
43exbii 1584 . . . 4  |-  ( E. x ( x  e. 
~P A  /\  ph ) 
<->  E. x ( x 
C_  A  /\  ph ) )
51, 4bitri 183 . . 3  |-  ( E. x  e.  ~P  A ph 
<->  E. x ( x 
C_  A  /\  ph ) )
65abbii 2253 . 2  |-  { y  |  E. x  e. 
~P  A ph }  =  { y  |  E. x ( x  C_  A  /\  ph ) }
7 abrexex2.1 . . . 4  |-  A  e. 
_V
87pwex 4102 . . 3  |-  ~P A  e.  _V
9 abrexex2.2 . . 3  |-  { y  |  ph }  e.  _V
108, 9abrexex2 6015 . 2  |-  { y  |  E. x  e. 
~P  A ph }  e.  _V
116, 10eqeltrri 2211 1  |-  { y  |  E. x ( x  C_  A  /\  ph ) }  e.  _V
Colors of variables: wff set class
Syntax hints:    /\ wa 103   E.wex 1468    e. wcel 1480   {cab 2123   E.wrex 2415   _Vcvv 2681    C_ wss 3066   ~Pcpw 3505
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-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-13 1491  ax-14 1492  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2119  ax-coll 4038  ax-sep 4041  ax-pow 4093  ax-pr 4126  ax-un 4350
This theorem depends on definitions:  df-bi 116  df-3an 964  df-tru 1334  df-nf 1437  df-sb 1736  df-eu 2000  df-mo 2001  df-clab 2124  df-cleq 2130  df-clel 2133  df-nfc 2268  df-ral 2419  df-rex 2420  df-reu 2421  df-rab 2423  df-v 2683  df-sbc 2905  df-csb 2999  df-un 3070  df-in 3072  df-ss 3079  df-pw 3507  df-sn 3528  df-pr 3529  df-op 3531  df-uni 3732  df-iun 3810  df-br 3925  df-opab 3985  df-mpt 3986  df-id 4210  df-xp 4540  df-rel 4541  df-cnv 4542  df-co 4543  df-dm 4544  df-rn 4545  df-res 4546  df-ima 4547  df-iota 5083  df-fun 5120  df-fn 5121  df-f 5122  df-f1 5123  df-fo 5124  df-f1o 5125  df-fv 5126
This theorem is referenced by: (None)
  Copyright terms: Public domain W3C validator