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Theorem 0elpw 4299
Description: Every power class contains the empty set. (Contributed by NM, 25-Oct-2007.)
Assertion
Ref Expression
0elpw ∅ ∈ 𝒫 𝐴

Proof of Theorem 0elpw
StepHypRef Expression
1 0ss 3561 . 2 ∅ ⊆ 𝐴
2 0ex 4258 . . 3 ∅ ∈ V
32elpw 3694 . 2 (∅ ∈ 𝒫 𝐴 ↔ ∅ ⊆ 𝐴)
41, 3mpbir 146 1 ∅ ∈ 𝒫 𝐴
Colors of variables: wff set class
Syntax hints:  wcel 2209  wss 3220  c0 3520  𝒫 cpw 3688
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-in1 623  ax-in2 624  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-nul 4257
This theorem 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-dif 3222  df-in 3226  df-ss 3233  df-nul 3521  df-pw 3690
This theorem is referenced by:  ordpwsucexmid  4715  pw1on  7579  pw1ne0  7581  ssenneg  11263  eupth2lemsfi  16702  pw1nct  17016  exmidpeirce  17020
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