Theorem vn0 3558

Description: The universal class is not equal to the empty set. (Contributed by NM, 11-Sep-2008.)

Assertion

Ref	Expression
vn0	|- _V =/= (/)

Proof of Theorem vn0

Step	Hyp	Ref	Expression
1		vex 2863	. 2 |- x e. _V
2		ne0i 3557	. 2 |- (x e. _V -> _V =/= (/))
3	1, 2	ax-mp 5	1 |- _V =/= (/)

Syntax hints:   e. wcel 1710   =/= wne 2517  _Vcvv 2860  (/)c0 3551

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334

This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2479  df-ne 2519  df-v 2862  df-nin 3212  df-compl 3213  df-in 3214  df-dif 3216  df-nul 3552

This theorem is referenced by:  uniintsn  3964  enpw  6088  2p1e3c  6157  ce0addcnnul  6180  ce2  6193  ncvsq  6257