Theorem nrelv 5699

Description: The universal class is not a relation. (Contributed by Thierry Arnoux, 23-Jan-2022.)

Assertion

Ref	Expression
nrelv	⊢ ¬ Rel V

Proof of Theorem nrelv

Step	Hyp	Ref	Expression
1		0ex 5226	. . 3 ⊢ ∅ ∈ V
2		0nelxp 5614	. . 3 ⊢ ¬ ∅ ∈ (V × V)
3		nelss 3980	. . 3 ⊢ ((∅ ∈ V ∧ ¬ ∅ ∈ (V × V)) → ¬ V ⊆ (V × V))
4	1, 2, 3	mp2an 688	. 2 ⊢ ¬ V ⊆ (V × V)
5		df-rel 5587	. 2 ⊢ (Rel V ↔ V ⊆ (V × V))
6	4, 5	mtbir 322	1 ⊢ ¬ Rel V

Syntax hints:  ¬ wn 3   ∈ wcel 2108  Vcvv 3422   ⊆ wss 3883  ∅c0 4253   × cxp 5578  Rel wrel 5585

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-ext 2709  ax-sep 5218  ax-nul 5225  ax-pr 5347

This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1784  df-sb 2069  df-clab 2716  df-cleq 2730  df-clel 2817  df-ne 2943  df-v 3424  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-nul 4254  df-if 4457  df-sn 4559  df-pr 4561  df-op 4565  df-opab 5133  df-xp 5586  df-rel 5587

This theorem is referenced by:  nfunv  6451  relintabex  41078