ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  elioo2 Unicode version

Theorem elioo2 10276
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 10270 . . 3  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  ( A (,) B )  =  { x  e.  RR  |  ( A  < 
x  /\  x  <  B ) } )
21eleq2d 2304 . 2  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  ( C  e.  ( A (,) B )  <->  C  e.  { x  e.  RR  | 
( A  <  x  /\  x  <  B ) } ) )
3 breq2 4118 . . . . 5  |-  ( x  =  C  ->  ( A  <  x  <->  A  <  C ) )
4 breq1 4117 . . . . 5  |-  ( x  =  C  ->  (
x  <  B  <->  C  <  B ) )
53, 4anbi12d 473 . . . 4  |-  ( x  =  C  ->  (
( A  <  x  /\  x  <  B )  <-> 
( A  <  C  /\  C  <  B ) ) )
65elrab 2976 . . 3  |-  ( C  e.  { x  e.  RR  |  ( A  <  x  /\  x  <  B ) }  <->  ( C  e.  RR  /\  ( A  <  C  /\  C  <  B ) ) )
7 3anass 1009 . . 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 1005    = wceq 1398    e. wcel 2205   {crab 2526   class class class wbr 4114  (class class class)co 6058   RRcr 8142   RR*cxr 8323    < clt 8324   (,)cioo 10243
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-13 2207  ax-14 2208  ax-ext 2216  ax-sep 4233  ax-pow 4292  ax-pr 4327  ax-un 4559  ax-setind 4664  ax-cnex 8234  ax-resscn 8235  ax-pre-ltirr 8255  ax-pre-ltwlin 8256  ax-pre-lttrn 8257
This theorem depends on definitions:  df-bi 117  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-nel 2510  df-ral 2527  df-rex 2528  df-rab 2531  df-v 2817  df-sbc 3046  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-br 4115  df-opab 4177  df-id 4419  df-po 4422  df-iso 4423  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-iota 5317  df-fun 5359  df-fv 5365  df-ov 6061  df-oprab 6062  df-mpo 6063  df-pnf 8326  df-mnf 8327  df-xr 8328  df-ltxr 8329  df-le 8330  df-ioo 10247
This theorem is referenced by:  eliooord  10283  elioopnf  10322  elioomnf  10323  dfrp2  10650  bl2ioo  15544  dedekindicc  15627  reeff1oleme  15766  reeff1o  15767  sin0pilem2  15776  pilem3  15777  sincosq1sgn  15820  sincosq2sgn  15821  sincosq3sgn  15822  sincosq4sgn  15823  sinq12gt0  15824  cosq14gt0  15826  cosq23lt0  15827  coseq0q4123  15828  coseq00topi  15829  coseq0negpitopi  15830  sincos6thpi  15836  cosordlem  15843  cos02pilt1  15845  cos0pilt1  15846  ioocosf1o  15848  iooref1o  16957  taupi  16998
  Copyright terms: Public domain W3C validator