Theorem elpwg 3614

Description: Membership in a power class. Theorem 86 of [Suppes] p. 47. (Contributed by NM, 6-Aug-2000.)

Assertion

Ref	Expression
elpwg	|- ( A e. V -> ( A e. ~P B <-> A C_ B ) )

Proof of Theorem elpwg

Dummy variable x is distinct from all other variables.

Step	Hyp	Ref	Expression
1		eleq1 2259	. 2 |- ( x = A -> ( x e. ~P B <-> A e. ~P B ) )
2		sseq1 3207	. 2 |- ( x = A -> ( x C_ B <-> A C_ B ) )
3		vex 2766	. . 3 |- x e. _V
4	3	elpw 3612	. 2 |- ( x e. ~P B <-> x C_ B )
5	1, 2, 4	vtoclbg 2825	1 |- ( A e. V -> ( A e. ~P B <-> A C_ B ) )

Syntax hints:   -> wi 4   <-> wb 105   e. wcel 2167   C_ wss 3157   ~Pcpw 3606

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-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-ext 2178

This theorem depends on definitions:  df-bi 117  df-tru 1367  df-nf 1475  df-sb 1777  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-v 2765  df-in 3163  df-ss 3170  df-pw 3608

This theorem is referenced by:  elpwi  3615  elpwb  3616  pwidg  3620  prsspwg  3783  elpw2g  4190  snelpwi  4246  prelpwi  4248  pwel  4252  eldifpw  4513  f1opw2  6133  2pwuninelg  6350  tfrlemibfn  6395  tfr1onlembfn  6411  tfrcllembfn  6424  elpmg  6732  pw2f1odclem  6904  fopwdom  6906  fiinopn  14324  ssntr  14442