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Theorem fun0 6604
Description: The empty set is a function. Theorem 10.3 of [Quine] p. 65. (Contributed by NM, 7-Apr-1998.)
Assertion
Ref Expression
fun0 Fun ∅

Proof of Theorem fun0
StepHypRef Expression
1 0ss 4389 . 2 ∅ ⊆ {⟨∅, ∅⟩}
2 0ex 5298 . . 3 ∅ ∈ V
32, 2funsn 6592 . 2 Fun {⟨∅, ∅⟩}
4 funss 6558 . 2 (∅ ⊆ {⟨∅, ∅⟩} → (Fun {⟨∅, ∅⟩} → Fun ∅))
51, 3, 4mp2 9 1 Fun ∅
Colors of variables: wff setvar class
Syntax hints:  wss 3941  c0 4315  {csn 4621  cop 4627  Fun wfun 6528
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-8 2100  ax-9 2108  ax-ext 2695  ax-sep 5290  ax-nul 5297  ax-pr 5418
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 845  df-3an 1086  df-tru 1536  df-fal 1546  df-ex 1774  df-sb 2060  df-mo 2526  df-clab 2702  df-cleq 2716  df-clel 2802  df-ral 3054  df-rex 3063  df-rab 3425  df-v 3468  df-dif 3944  df-un 3946  df-in 3948  df-ss 3958  df-nul 4316  df-if 4522  df-sn 4622  df-pr 4624  df-op 4628  df-br 5140  df-opab 5202  df-id 5565  df-xp 5673  df-rel 5674  df-cnv 5675  df-co 5676  df-fun 6536
This theorem is referenced by:  funcnv0  6605  fn0  6672  0fsupp  9382  strle1  17092  lubfun  18309  glbfun  18322  1pthdlem1  29860  fineqvac  34588
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