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Theorem opwo0id 4384
Description: An ordered pair is equal to the ordered pair without the empty set. This is because no ordered pair contains the empty set. (Contributed by AV, 15-Nov-2021.)
Assertion
Ref Expression
opwo0id  |-  <. X ,  Y >.  =  ( <. X ,  Y >.  \  { (/) } )

Proof of Theorem opwo0id
StepHypRef Expression
1 0nelop 4383 . . . 4  |-  -.  (/)  e.  <. X ,  Y >.
2 disjsn 3767 . . . 4  |-  ( (
<. X ,  Y >.  i^i 
{ (/) } )  =  (/) 
<->  -.  (/)  e.  <. X ,  Y >. )
31, 2mpbir 146 . . 3  |-  ( <. X ,  Y >.  i^i 
{ (/) } )  =  (/)
4 disjdif2 3603 . . 3  |-  ( (
<. X ,  Y >.  i^i 
{ (/) } )  =  (/)  ->  ( <. X ,  Y >.  \  { (/) } )  =  <. X ,  Y >. )
53, 4ax-mp 5 . 2  |-  ( <. X ,  Y >.  \  { (/) } )  = 
<. X ,  Y >.
65eqcomi 2242 1  |-  <. X ,  Y >.  =  ( <. X ,  Y >.  \  { (/) } )
Colors of variables: wff set class
Syntax hints:   -. wn 3    = wceq 1402    e. wcel 2209    \ cdif 3217    i^i cin 3219   (/)c0 3520   {csn 3705   <.cop 3708
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 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220
This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-ral 2533  df-rab 2537  df-v 2823  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-sn 3711  df-pr 3712  df-op 3714
This theorem is referenced by:  fundm2domnop0  11278
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