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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 ⊆ 𝒫 𝐵 𝐴𝐵)

Proof of Theorem sspwuni
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 vex 2824 . . . 4 𝑥 ∈ V
21elpw 3694 . . 3 (𝑥 ∈ 𝒫 𝐵𝑥𝐵)
32ralbii 2556 . 2 (∀𝑥𝐴 𝑥 ∈ 𝒫 𝐵 ↔ ∀𝑥𝐴 𝑥𝐵)
4 dfss3 3236 . 2 (𝐴 ⊆ 𝒫 𝐵 ↔ ∀𝑥𝐴 𝑥 ∈ 𝒫 𝐵)
5 unissb 3965 . 2 ( 𝐴𝐵 ↔ ∀𝑥𝐴 𝑥𝐵)
63, 4, 53bitr4i 212 1 (𝐴 ⊆ 𝒫 𝐵 𝐴𝐵)
Colors of variables:    wff set class
This proof depends on syntax axioms:  wb 105  wcel 2209  wral 2528  wss 3220  𝒫 cpw 3688   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  10386  restid  13655  lssintclm  14772  topgele  15182  topontopn  15190  unitg  15215  epttop  15243  resttopon  15324  txuni2  15409  txdis  15430  unirnblps  15575  unirnbl  15576
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