Theorem tpnz 3614

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 3600	. 2 |- A e. { A , B , C }
3		ne0i 3335	. 2 |- ( A e. { A , B , C } -> { A , B , C } =/= (/) )
4	2, 3	ax-mp 7	1 |- { A , B , C } =/= (/)

Syntax hints:   e. wcel 1463   =/= wne 2282   _Vcvv 2657   (/)c0 3329   {ctp 3495

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 586  ax-in2 587  ax-io 681  ax-5 1406  ax-7 1407  ax-gen 1408  ax-ie1 1452  ax-ie2 1453  ax-8 1465  ax-10 1466  ax-11 1467  ax-i12 1468  ax-bndl 1469  ax-4 1470  ax-17 1489  ax-i9 1493  ax-ial 1497  ax-i5r 1498  ax-ext 2097

This theorem depends on definitions:  df-bi 116  df-3or 946  df-tru 1317  df-nf 1420  df-sb 1719  df-clab 2102  df-cleq 2108  df-clel 2111  df-nfc 2244  df-ne 2283  df-v 2659  df-dif 3039  df-un 3041  df-nul 3330  df-sn 3499  df-pr 3500  df-tp 3501

This theorem is referenced by: (None)