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Theorem opi2 2861
Description: One of the two elements of an ordered pair.
Assertion
Ref Expression
opi2 |- {A, B} e. <.A, B>.

Proof of Theorem opi2
StepHypRef Expression
1 prex 2857 . . 3 |- {A, B} e. V
21prid2 2514 . 2 |- {A, B} e. {{A}, {A, B}}
3 df-op 2474 . 2 |- <.A, B>. = {{A}, {A, B}}
42, 3eleqtrri 1590 1 |- {A, B} e. <.A, B>.
Colors of variables: wff set class
Syntax hints:   e. wcel 994  {csn 2467  {cpr 2468  <.cop 2469
This theorem is referenced by:  uniopel 2886  opeluu 3103  elvvuni 3315
This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 998  ax-gen 999  ax-8 1000  ax-10 1002  ax-11 1003  ax-12 1004  ax-13 1005  ax-14 1006  ax-17 1007  ax-4 1009  ax-5o 1011  ax-6o 1014  ax-9o 1159  ax-10o 1177  ax-16 1247  ax-11o 1255  ax-ext 1500  ax-sep 2777  ax-pow 2818  ax-pr 2855
This theorem depends on definitions:  df-bi 145  df-or 222  df-an 223  df-ex 1017  df-sb 1209  df-eu 1421  df-mo 1422  df-clab 1506  df-cleq 1511  df-clel 1514  df-ne 1630  df-v 1858  df-dif 2101  df-un 2102  df-in 2103  df-ss 2105  df-nul 2333  df-pw 2459  df-sn 2470  df-pr 2471  df-op 2474
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