Theorem tpnz 3817

Description: A triplet containing a set is not empty. (Contributed by NM, 10-Apr-1994.)

Hypothesis

Ref	Expression
tpnz.1	|- A e. _V

Assertion

Ref	Expression
tpnz	|- { A , B , C } =/= (/)

Proof of Theorem tpnz

Step	Hyp	Ref	Expression
1		tpnz.1	. . 3 |- A e. _V
2	1	tpid1 3802	. 2 |- A e. { A , B , C }
3		ne0i 3514	. 2 |- ( A e. { A , B , C } -> { A , B , C } =/= (/) )
4	2, 3	ax-mp 5	1 |- { A , B , C } =/= (/)

Syntax hints:   e. wcel 2203   =/= wne 2412   _Vcvv 2812   (/)c0 3507   {ctp 3690

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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2214

This theorem depends on definitions:  df-bi 117  df-3or 1006  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ne 2413  df-v 2814  df-dif 3212  df-un 3214  df-nul 3508  df-sn 3694  df-pr 3695  df-tp 3696

This theorem is referenced by: (None)