Theorem onnev 5848

Description: The class of ordinal numbers is not equal to the universe. (Contributed by NM, 16-Jun-2007.) (Proof shortened by Mario Carneiro, 10-Jan-2013.)

Assertion

Ref	Expression
onnev	|- On =/= _V

Proof of Theorem onnev

Step	Hyp	Ref	Expression
1		snsn0non 5846	. 2 |- -. { { (/) } } e. On
2		snex 4908	. . . 4 |- { { (/) } } e. _V
3		id 22	. . . 4 |- ( On = _V -> On = _V )
4	2, 3	syl5eleqr 2708	. . 3 |- ( On = _V -> { { (/) } } e. On )
5	4	necon3bi 2820	. 2 |- ( -. { { (/) } } e. On -> On =/= _V )
6	1, 5	ax-mp 5	1 |- On =/= _V

Syntax hints:   -. wn 3   = wceq 1483   e. wcel 1990   =/= wne 2794   _Vcvv 3200   (/)c0 3915   {csn 4177   Oncon0 5723

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-sbc 3436  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-br 4654  df-opab 4713  df-tr 4753  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-ord 5726  df-on 5727

This theorem is referenced by: (None)