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Theorem opabss 2100
Description: The collection of ordered pairs in a class is a subclass of it.
Assertion
Ref Expression
opabss |- {<.x, y>. | xRy} (_ R
Distinct variable group(s):   x,R   y,R

Proof of Theorem opabss
StepHypRef Expression
1 df-opab 2098 . . 3 |- {<.x, y>. | xRy} = {z | E.xE.y(z = <.x, y>. /\ xRy)}
2 eleq1 1149 . . . . . . 7 |- (z = <.x, y>. -> (z e. R <-> <.x, y>. e. R))
32biimpar 325 . . . . . 6 |- ((z = <.x, y>. /\ <.x, y>. e. R) -> z e. R)
4 df-br 2063 . . . . . 6 |- (xRy <-> <.x, y>. e. R)
53, 4sylan2b 347 . . . . 5 |- ((z = <.x, y>. /\ xRy) -> z e. R)
6519.23aivv 953 . . . 4 |- (E.xE.y(z = <.x, y>. /\ xRy) -> z e. R)
76ss2abi 1552 . . 3 |- {z | E.xE.y(z = <.x, y>. /\ xRy)} (_ {z | z e. R}
81, 7eqsstr 1530 . 2 |- {<.x, y>. | xRy} (_ {z | z e. R}
9 abid2 1186 . 2 |- {z | z e. R} = R
108, 9sseqtr 1532 1 |- {<.x, y>. | xRy} (_ R
Colors of variables: wff set class
Syntax hints:   /\ wa 196  E.wex 678  {cab 1090   = wceq 1091   e. wcel 1092   (_ wss 1487  <.cop 1810   class class class wbr 2054  {copab 2055
This theorem is referenced by:  cotr 2625  cnvsym 2626
This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6  ax-4 673  ax-5 674  ax-6 675  ax-7 676  ax-gen 677  ax-8 798  ax-9 799  ax-10 800  ax-11 801  ax-12 802  ax-16 922  ax-17 925  ax-ext 1074
This theorem depends on definitions:  df-bi 128  df-an 198  df-ex 679  df-sb 853  df-clab 1093  df-cleq 1097  df-clel 1099  df-in 1491  df-ss 1492  df-br 2063  df-opab 2098
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