ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  0elpw GIF version

Theorem 0elpw 4150
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 3453 . 2 ∅ ⊆ 𝐴
2 0ex 4116 . . 3 ∅ ∈ V
32elpw 3572 . 2 (∅ ∈ 𝒫 𝐴 ↔ ∅ ⊆ 𝐴)
41, 3mpbir 145 1 ∅ ∈ 𝒫 𝐴
Colors of variables: wff set class
Syntax hints:  wcel 2141  wss 3121  c0 3414  𝒫 cpw 3566
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 609  ax-in2 610  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-ext 2152  ax-nul 4115
This theorem depends on definitions:  df-bi 116  df-tru 1351  df-nf 1454  df-sb 1756  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-v 2732  df-dif 3123  df-in 3127  df-ss 3134  df-nul 3415  df-pw 3568
This theorem is referenced by:  ordpwsucexmid  4554  pw1on  7203  pw1ne0  7205  pw1nct  14036
  Copyright terms: Public domain W3C validator