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Theorem nfunv 2693
Description: The universe is not a function. (Contributed by Raph Levien, 27-Jan-04.)
Assertion
Ref Expression
nfunv ¬ Fun V

Proof of Theorem nfunv
StepHypRef Expression
1 0nelxp 2475 . . 3 ¬ ∅ ∈ (V × V)
2 0ex 1745 . . . 4 ∅ ∈ V
3 df-rel 2425 . . . . . 6 (Rel VV ⊆ (V × V))
43biimp 133 . . . . 5 (Rel VV ⊆ (V × V))
54sseld 1506 . . . 4 (Rel V → (∅ ∈ V → ∅ ∈ (V × V)))
62, 5mpi 44 . . 3 (Rel V → ∅ ∈ (V × V))
71, 6mto 93 . 2 ¬ Rel V
8 funrel 2681 . 2 (Fun V → Rel V)
97, 8mto 93 1 ¬ Fun V
Colors of variables: wff set class
Syntax hints:  ¬ wn 1   ∈ wcel 1092  Vcvv 1348   ⊆ wss 1487  ∅c0 1707   × cxp 2408  Rel wrel 2415  Fun wfun 2416
This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6  ax-4 673  ax-5 674  ax-6 675  ax-7 676  ax-gen 677  ax-8 798  ax-9 799  ax-10 800  ax-11 801  ax-12 802  ax-13 804  ax-14 805  ax-16 922  ax-17 925  ax-ext 1074  ax-rep 1075  ax-pow 1077
This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-ex 679  df-sb 853  df-clab 1093  df-cleq 1097  df-clel 1099  df-v 1349  df-dif 1489  df-un 1490  df-in 1491  df-ss 1492  df-nul 1708  df-pw 1799  df-sn 1811  df-pr 1812  df-op 1815  df-opab 2098  df-xp 2424  df-rel 2425  df-fun 2432
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