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Theorem opprc1b 3542
Description: A property of an ordered pair of proper classes (due to our particular definition of ordered pair).
Assertion
Ref Expression
opprc1b |- (-. A e. _V <-> (/) e. <.A, B>.)

Proof of Theorem opprc1b
StepHypRef Expression
1 opprc1 3170 . . 3 |- (-. A e. _V -> <.A, B>. = {(/), {B}})
2 0ex 3446 . . . 4 |- (/) e. _V
32prid1 3106 . . 3 |- (/) e. {(/), {B}}
41, 3syl5eleqr 1978 . 2 |- (-. A e. _V -> (/) e. <.A, B>.)
5 opeq1 3158 . . . . . 6 |- (x = A -> <.x, B>. = <.A, B>.)
65eleq2d 1964 . . . . 5 |- (x = A -> ((/) e. <.x, B>. <-> (/) e. <.A, B>.))
76notbid 673 . . . 4 |- (x = A -> (-. (/) e. <.x, B>. <-> -. (/) e. <.A, B>.))
8 visset 2295 . . . . . . . . 9 |- x e. _V
98snnz 3119 . . . . . . . 8 |- {x} =/= (/)
10 df-ne 2019 . . . . . . . 8 |- ({x} =/= (/) <-> -. {x} = (/))
119, 10mpbi 206 . . . . . . 7 |- -. {x} = (/)
12 eqcom 1886 . . . . . . 7 |- ({x} = (/) <-> (/) = {x})
1311, 12mtbi 208 . . . . . 6 |- -. (/) = {x}
148prnz 3120 . . . . . . . 8 |- {x, B} =/= (/)
15 df-ne 2019 . . . . . . . 8 |- ({x, B} =/= (/) <-> -. {x, B} = (/))
1614, 15mpbi 206 . . . . . . 7 |- -. {x, B} = (/)
17 eqcom 1886 . . . . . . 7 |- ({x, B} = (/) <-> (/) = {x, B})
1816, 17mtbi 208 . . . . . 6 |- -. (/) = {x, B}
1913, 18pm3.2ni 640 . . . . 5 |- -. ((/) = {x} \/ (/) = {x, B})
202elop 3528 . . . . 5 |- ((/) e. <.x, B>. <-> ((/) = {x} \/ (/) = {x, B}))
2119, 20mtbir 209 . . . 4 |- -. (/) e. <.x, B>.
227, 21vtoclg 2346 . . 3 |- (A e. _V -> -. (/) e. <.A, B>.)
2322con2i 113 . 2 |- ((/) e. <.A, B>. -> -. A e. _V)
244, 23impbii 174 1 |- (-. A e. _V <-> (/) e. <.A, B>.)
Colors of variables: wff set class
Syntax hints:  -. wn 2   <-> wb 163   \/ wo 239   = wceq 1298   e. wcel 1300   =/= wne 2017  _Vcvv 2292  (/)c0 2875  {csn 3044  {cpr 3045  <.cop 3046
This theorem is referenced by:  opprc3 3543  opeqex 3544  opth2 3546  0nelelxp 4067  onxpdisjOLD 4069  dmsnopOLD 4368  funopg 4454
This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 1304  ax-gen 1305  ax-8 1306  ax-9 1307  ax-10 1308  ax-11 1309  ax-12 1310  ax-17 1317  ax-4 1319  ax-5o 1321  ax-6o 1324  ax-9o 1481  ax-10o 1500  ax-16 1580  ax-11o 1588  ax-ext 1865  ax-nul 3445
This theorem depends on definitions:  df-bi 164  df-or 241  df-an 242  df-ex 1327  df-sb 1536  df-clab 1872  df-cleq 1877  df-clel 1880  df-ne 2019  df-v 2294  df-dif 2597  df-un 2600  df-nul 2876  df-sn 3049  df-pr 3050  df-op 3053
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