ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  elpw2g Unicode version

Theorem elpw2g 4292
Description: Membership in a power class. Theorem 86 of [Suppes] p. 47. (Contributed by NM, 7-Aug-2000.)
Assertion
Ref Expression
elpw2g  |-  ( B  e.  V  ->  ( A  e.  ~P B  <->  A 
C_  B ) )

Proof of Theorem elpw2g
StepHypRef Expression
1 elpwi 3698 . 2  |-  ( A  e.  ~P B  ->  A  C_  B )
2 ssexg 4272 . . . 4  |-  ( ( A  C_  B  /\  B  e.  V )  ->  A  e.  _V )
3 elpwg 3696 . . . . 5  |-  ( A  e.  _V  ->  ( A  e.  ~P B  <->  A 
C_  B ) )
43biimparc 299 . . . 4  |-  ( ( A  C_  B  /\  A  e.  _V )  ->  A  e.  ~P B
)
52, 4syldan 282 . . 3  |-  ( ( A  C_  B  /\  B  e.  V )  ->  A  e.  ~P B
)
65expcom 116 . 2  |-  ( B  e.  V  ->  ( A  C_  B  ->  A  e.  ~P B ) )
71, 6impbid2 143 1  |-  ( B  e.  V  ->  ( A  e.  ~P B  <->  A 
C_  B ) )
Colors of variables:    wff set class
This proof depends on syntax axioms:    -> wi 4    <-> wb 105    e. wcel 2209   _Vcvv 2821    C_ wss 3220   ~Pcpw 3688
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220  ax-sep 4249
This proof depends on definitions:  df-bi 117  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-v 2823  df-in 3226  df-ss 3233  df-pw 3690
This theorem is used by:  elpw2  4293  if0elpw  4295  pwnss  4296  ifelpwung  4627  pw2f1odclem  7134  elfir  7307  2omap  7318  issubm  13828  issubg  14025  issubrng  14556  issubrg  14578  islssm  14743  islssmg  14744  lspval  14776  lspcl  14777  sraval  14823  aspval  15064  istopg  15149  uniopn  15151  iscld  15253  ntrval  15260  clsval  15261  discld  15286  neival  15293  isnei  15294  restdis  15334  cnpfval  15345  cndis  15391  blfvalps  15535  blfps  15559  blf  15560  reldvg  15829  pw1map  17144
  Copyright terms: Public domain W3C validator