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Theorem opwo0id 4347
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 4346 . . . 4  |-  -.  (/)  e.  <. X ,  Y >.
2 disjsn 3735 . . . 4  |-  ( (
<. X ,  Y >.  i^i 
{ (/) } )  =  (/) 
<->  -.  (/)  e.  <. X ,  Y >. )
31, 2mpbir 146 . . 3  |-  ( <. X ,  Y >.  i^i 
{ (/) } )  =  (/)
4 disjdif2 3575 . . 3  |-  ( (
<. X ,  Y >.  i^i 
{ (/) } )  =  (/)  ->  ( <. X ,  Y >.  \  { (/) } )  =  <. X ,  Y >. )
53, 4ax-mp 5 . 2  |-  ( <. X ,  Y >.  \  { (/) } )  = 
<. X ,  Y >.
65eqcomi 2235 1  |-  <. X ,  Y >.  =  ( <. X ,  Y >.  \  { (/) } )
Colors of variables: wff set class
Syntax hints:   -. wn 3    = wceq 1398    e. wcel 2202    \ cdif 3198    i^i cin 3200   (/)c0 3496   {csn 3673   <.cop 3676
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 2213
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ne 2404  df-ral 2516  df-rab 2520  df-v 2805  df-dif 3203  df-un 3205  df-in 3207  df-ss 3214  df-nul 3497  df-sn 3679  df-pr 3680  df-op 3682
This theorem is referenced by:  fundm2domnop0  11158
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