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Theorem elioo2 10134
Description: Membership in an open interval of extended reals. (Contributed by NM, 6-Feb-2007.)
Assertion
Ref Expression
elioo2  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  ( C  e.  ( A (,) B )  <->  ( C  e.  RR  /\  A  < 
C  /\  C  <  B ) ) )

Proof of Theorem elioo2
Dummy variable  x is distinct from all other variables.
StepHypRef Expression
1 iooval2 10128 . . 3  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  ( A (,) B )  =  { x  e.  RR  |  ( A  < 
x  /\  x  <  B ) } )
21eleq2d 2299 . 2  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  ( C  e.  ( A (,) B )  <->  C  e.  { x  e.  RR  | 
( A  <  x  /\  x  <  B ) } ) )
3 breq2 4087 . . . . 5  |-  ( x  =  C  ->  ( A  <  x  <->  A  <  C ) )
4 breq1 4086 . . . . 5  |-  ( x  =  C  ->  (
x  <  B  <->  C  <  B ) )
53, 4anbi12d 473 . . . 4  |-  ( x  =  C  ->  (
( A  <  x  /\  x  <  B )  <-> 
( A  <  C  /\  C  <  B ) ) )
65elrab 2959 . . 3  |-  ( C  e.  { x  e.  RR  |  ( A  <  x  /\  x  <  B ) }  <->  ( C  e.  RR  /\  ( A  <  C  /\  C  <  B ) ) )
7 3anass 1006 . . 3  |-  ( ( C  e.  RR  /\  A  <  C  /\  C  <  B )  <->  ( C  e.  RR  /\  ( A  <  C  /\  C  <  B ) ) )
86, 7bitr4i 187 . 2  |-  ( C  e.  { x  e.  RR  |  ( A  <  x  /\  x  <  B ) }  <->  ( C  e.  RR  /\  A  < 
C  /\  C  <  B ) )
92, 8bitrdi 196 1  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  ( C  e.  ( A (,) B )  <->  ( C  e.  RR  /\  A  < 
C  /\  C  <  B ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    <-> wb 105    /\ w3a 1002    = wceq 1395    e. wcel 2200   {crab 2512   class class class wbr 4083  (class class class)co 6010   RRcr 8014   RR*cxr 8196    < clt 8197   (,)cioo 10101
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 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-sep 4202  ax-pow 4259  ax-pr 4294  ax-un 4525  ax-setind 4630  ax-cnex 8106  ax-resscn 8107  ax-pre-ltirr 8127  ax-pre-ltwlin 8128  ax-pre-lttrn 8129
This theorem depends on definitions:  df-bi 117  df-3or 1003  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-nel 2496  df-ral 2513  df-rex 2514  df-rab 2517  df-v 2801  df-sbc 3029  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3889  df-br 4084  df-opab 4146  df-id 4385  df-po 4388  df-iso 4389  df-xp 4726  df-rel 4727  df-cnv 4728  df-co 4729  df-dm 4730  df-iota 5281  df-fun 5323  df-fv 5329  df-ov 6013  df-oprab 6014  df-mpo 6015  df-pnf 8199  df-mnf 8200  df-xr 8201  df-ltxr 8202  df-le 8203  df-ioo 10105
This theorem is referenced by:  eliooord  10141  elioopnf  10180  elioomnf  10181  dfrp2  10500  bl2ioo  15245  dedekindicc  15328  reeff1oleme  15467  reeff1o  15468  sin0pilem2  15477  pilem3  15478  sincosq1sgn  15521  sincosq2sgn  15522  sincosq3sgn  15523  sincosq4sgn  15524  sinq12gt0  15525  cosq14gt0  15527  cosq23lt0  15528  coseq0q4123  15529  coseq00topi  15530  coseq0negpitopi  15531  sincos6thpi  15537  cosordlem  15544  cos02pilt1  15546  cos0pilt1  15547  ioocosf1o  15549  iooref1o  16516  taupi  16555
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