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Theorem elioore 10293
Description: A member of an open interval of reals is a real. (Contributed by NM, 17-Aug-2008.) (Revised by Mario Carneiro, 3-Nov-2013.)
Assertion
Ref Expression
elioore  |-  ( A  e.  ( B (,) C )  ->  A  e.  RR )

Proof of Theorem elioore
StepHypRef Expression
1 elioo3g 10291 . 2  |-  ( A  e.  ( B (,) C )  <->  ( ( B  e.  RR*  /\  C  e.  RR*  /\  A  e. 
RR* )  /\  ( B  <  A  /\  A  <  C ) ) )
2 3ancomb 1017 . . 3  |-  ( ( B  e.  RR*  /\  C  e.  RR*  /\  A  e. 
RR* )  <->  ( B  e.  RR*  /\  A  e. 
RR*  /\  C  e.  RR* ) )
3 xrre2 10202 . . 3  |-  ( ( ( B  e.  RR*  /\  A  e.  RR*  /\  C  e.  RR* )  /\  ( B  <  A  /\  A  <  C ) )  ->  A  e.  RR )
42, 3sylanb 284 . 2  |-  ( ( ( B  e.  RR*  /\  C  e.  RR*  /\  A  e.  RR* )  /\  ( B  <  A  /\  A  <  C ) )  ->  A  e.  RR )
51, 4sylbi 121 1  |-  ( A  e.  ( B (,) C )  ->  A  e.  RR )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    /\ w3a 1009    e. wcel 2209   class class class wbr 4125  (class class class)co 6075   RRcr 8168   RR*cxr 8349    < clt 8350   (,)cioo 10269
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 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4244  ax-pow 4306  ax-pr 4341  ax-un 4573  ax-setind 4679  ax-cnex 8260  ax-resscn 8261  ax-pre-ltirr 8281  ax-pre-ltwlin 8282  ax-pre-lttrn 8283
This theorem depends on definitions:  df-bi 117  df-3or 1010  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-rab 2537  df-v 2823  df-sbc 3052  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-br 4126  df-opab 4188  df-id 4433  df-po 4436  df-iso 4437  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-iota 5332  df-fun 5374  df-fv 5380  df-ov 6078  df-oprab 6079  df-mpo 6080  df-pnf 8352  df-mnf 8353  df-xr 8354  df-ltxr 8355  df-le 8356  df-ioo 10273
This theorem is referenced by:  iooval2  10296  elioo4g  10315  ioossre  10316  zltaddlt1le  10389  tgioo  15578  ivthinc  15667  ivthdichlem  15675  reeff1oleme  15796  sin0pilem1  15805  sin0pilem2  15806  pilem3  15807  pire  15810  sinq34lt0t  15855  cosq14gt0  15856  cosq23lt0  15857  coseq0q4123  15858  tanrpcl  15861  tangtx  15862  cos02pilt1  15875  cos0pilt1  15876  ioocosf1o  15878  iooref1o  16988
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