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Theorem 0elpw 4282
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 3551 . 2 ∅ ⊆ 𝐴
2 0ex 4242 . . 3 ∅ ∈ V
32elpw 3680 . 2 (∅ ∈ 𝒫 𝐴 ↔ ∅ ⊆ 𝐴)
41, 3mpbir 146 1 ∅ ∈ 𝒫 𝐴
Colors of variables: wff set class
Syntax hints:  wcel 2205  wss 3214  c0 3512  𝒫 cpw 3674
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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2216  ax-nul 4241
This theorem depends on definitions:  df-bi 117  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-v 2817  df-dif 3216  df-in 3220  df-ss 3227  df-nul 3513  df-pw 3676
This theorem is referenced by:  ordpwsucexmid  4697  pw1on  7549  pw1ne0  7551  ssenneg  11229  eupth2lemsfi  16585  pw1nct  16889  exmidpeirce  16893
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