Theorem elpwg 3583

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 2240	. 2 |- ( x = A -> ( x e. ~P B <-> A e. ~P B ) )
2		sseq1 3178	. 2 |- ( x = A -> ( x C_ B <-> A C_ B ) )
3		vex 2740	. . 3 |- x e. _V
4	3	elpw 3581	. 2 |- ( x e. ~P B <-> x C_ B )
5	1, 2, 4	vtoclbg 2798	1 |- ( A e. V -> ( A e. ~P B <-> A C_ B ) )

Syntax hints:   -> wi 4   <-> wb 105   e. wcel 2148   C_ wss 3129   ~Pcpw 3575

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 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-ext 2159

This theorem depends on definitions:  df-bi 117  df-tru 1356  df-nf 1461  df-sb 1763  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-v 2739  df-in 3135  df-ss 3142  df-pw 3577

This theorem is referenced by:  elpwi  3584  elpwb  3585  pwidg  3589  prsspwg  3752  elpw2g  4156  snelpwi  4212  prelpwi  4214  pwel  4218  eldifpw  4477  f1opw2  6076  2pwuninelg  6283  tfrlemibfn  6328  tfr1onlembfn  6344  tfrcllembfn  6357  elpmg  6663  fopwdom  6835  fiinopn  13474  ssntr  13592