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Theorem nfunv 5350
Description: The universe is not a function. (Contributed by Raph Levien, 27-Jan-2004.)
Assertion
Ref Expression
nfunv ¬ Fun V

Proof of Theorem nfunv
StepHypRef Expression
1 0nelxp 4746 . . 3 ¬ ∅ ∈ (V × V)
2 0ex 4210 . . . 4 ∅ ∈ V
3 df-rel 4725 . . . . . 6 (Rel V ↔ V ⊆ (V × V))
43biimpi 120 . . . . 5 (Rel V → V ⊆ (V × V))
54sseld 3223 . . . 4 (Rel V → (∅ ∈ V → ∅ ∈ (V × V)))
62, 5mpi 15 . . 3 (Rel V → ∅ ∈ (V × V))
71, 6mto 666 . 2 ¬ Rel V
8 funrel 5334 . 2 (Fun V → Rel V)
97, 8mto 666 1 ¬ Fun V
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wcel 2200  Vcvv 2799  wss 3197  c0 3491   × cxp 4716  Rel wrel 4723  Fun wfun 5311
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 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-14 2203  ax-ext 2211  ax-sep 4201  ax-nul 4209  ax-pow 4257  ax-pr 4292
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-v 2801  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-nul 3492  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-opab 4145  df-xp 4724  df-rel 4725  df-fun 5319
This theorem is referenced by: (None)
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