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Theorem opnzi 4943
Description: An ordered pair is nonempty if the arguments are sets. (Contributed by Mario Carneiro, 26-Apr-2015.)
Hypotheses
Ref Expression
opth1.1  |-  A  e. 
_V
opth1.2  |-  B  e. 
_V
Assertion
Ref Expression
opnzi  |-  <. A ,  B >.  =/=  (/)

Proof of Theorem opnzi
StepHypRef Expression
1 opth1.1 . 2  |-  A  e. 
_V
2 opth1.2 . 2  |-  B  e. 
_V
3 opnz 4942 . 2  |-  ( <. A ,  B >.  =/=  (/) 
<->  ( A  e.  _V  /\  B  e.  _V )
)
41, 2, 3mpbir2an 955 1  |-  <. A ,  B >.  =/=  (/)
Colors of variables: wff setvar class
Syntax hints:    e. wcel 1990    =/= wne 2794   _Vcvv 3200   (/)c0 3915   <.cop 4183
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-pr 4906
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-v 3202  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-op 4184
This theorem is referenced by:  opelopabsb  4985  0nelxp  5143  0nelxpOLD  5144  unixp0  5669  funopsn  6413  0neqopab  6698  cnfldfunALT  19759  finxpreclem2  33227  finxp0  33228  finxpreclem6  33233
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