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Theorem sspwuni 4097
Description: Subclass relationship for power class and union. (Contributed by NM, 18-Jul-2006.)
Assertion
Ref Expression
sspwuni  |-  ( A 
C_  ~P B  <->  U. A  C_  B )

Proof of Theorem sspwuni
Dummy variable  x is distinct from all other variables.
StepHypRef Expression
1 vex 2824 . . . 4  |-  x  e. 
_V
21elpw 3694 . . 3  |-  ( x  e.  ~P B  <->  x  C_  B
)
32ralbii 2556 . 2  |-  ( A. x  e.  A  x  e.  ~P B  <->  A. x  e.  A  x  C_  B
)
4 dfss3 3236 . 2  |-  ( A 
C_  ~P B  <->  A. x  e.  A  x  e.  ~P B )
5 unissb 3965 . 2  |-  ( U. A  C_  B  <->  A. x  e.  A  x  C_  B
)
63, 4, 53bitr4i 212 1  |-  ( A 
C_  ~P B  <->  U. A  C_  B )
Colors of variables:    wff set class
This proof depends on syntax axioms:    <-> wb 105    e. wcel 2209   A.wral 2528    C_ wss 3220   ~Pcpw 3688   U.cuni 3935
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
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-ral 2533  df-v 2823  df-in 3226  df-ss 3233  df-pw 3690  df-uni 3936
This theorem is used by:  pwssb  4098  elpwpw  4099  elpwuni  4102  rintm  4105  dftr4  4234  iotass  5355  tfrlemibfn  6599  tfr1onlembfn  6615  tfrcllembfn  6628  uniixp  7003  fipwssg  7313  unirnioo  10375  restid  13604  lssintclm  14721  topgele  15130  topontopn  15138  unitg  15163  epttop  15191  resttopon  15272  txuni2  15357  txdis  15378  unirnblps  15523  unirnbl  15524
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