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Theorem xrletr 9806
Description: Transitive law for ordering on extended reals. (Contributed by NM, 9-Feb-2006.)
Assertion
Ref Expression
xrletr  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  (
( A  <_  B  /\  B  <_  C )  ->  A  <_  C
) )

Proof of Theorem xrletr
StepHypRef Expression
1 xrltso 9794 . . . . . 6  |-  <  Or  RR*
2 sowlin 4320 . . . . . 6  |-  ( (  <  Or  RR*  /\  ( C  e.  RR*  /\  A  e.  RR*  /\  B  e. 
RR* ) )  -> 
( C  <  A  ->  ( C  <  B  \/  B  <  A ) ) )
31, 2mpan 424 . . . . 5  |-  ( ( C  e.  RR*  /\  A  e.  RR*  /\  B  e. 
RR* )  ->  ( C  <  A  ->  ( C  <  B  \/  B  <  A ) ) )
433coml 1210 . . . 4  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  ( C  <  A  ->  ( C  <  B  \/  B  <  A ) ) )
5 orcom 728 . . . 4  |-  ( ( C  <  B  \/  B  <  A )  <->  ( B  <  A  \/  C  < 
B ) )
64, 5imbitrdi 161 . . 3  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  ( C  <  A  ->  ( B  <  A  \/  C  <  B ) ) )
76con3d 631 . 2  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  ( -.  ( B  <  A  \/  C  <  B )  ->  -.  C  <  A ) )
8 xrlenlt 8020 . . . . 5  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  ( A  <_  B  <->  -.  B  <  A ) )
983adant3 1017 . . . 4  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  ( A  <_  B  <->  -.  B  <  A ) )
10 xrlenlt 8020 . . . . 5  |-  ( ( B  e.  RR*  /\  C  e.  RR* )  ->  ( B  <_  C  <->  -.  C  <  B ) )
11103adant1 1015 . . . 4  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  ( B  <_  C  <->  -.  C  <  B ) )
129, 11anbi12d 473 . . 3  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  (
( A  <_  B  /\  B  <_  C )  <-> 
( -.  B  < 
A  /\  -.  C  <  B ) ) )
13 ioran 752 . . 3  |-  ( -.  ( B  <  A  \/  C  <  B )  <-> 
( -.  B  < 
A  /\  -.  C  <  B ) )
1412, 13bitr4di 198 . 2  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  (
( A  <_  B  /\  B  <_  C )  <->  -.  ( B  <  A  \/  C  <  B ) ) )
15 xrlenlt 8020 . . 3  |-  ( ( A  e.  RR*  /\  C  e.  RR* )  ->  ( A  <_  C  <->  -.  C  <  A ) )
16153adant2 1016 . 2  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  ( A  <_  C  <->  -.  C  <  A ) )
177, 14, 163imtr4d 203 1  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  (
( A  <_  B  /\  B  <_  C )  ->  A  <_  C
) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 104    <-> wb 105    \/ wo 708    /\ w3a 978    e. wcel 2148   class class class wbr 4003    Or wor 4295   RR*cxr 7989    < clt 7990    <_ cle 7991
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 614  ax-in2 615  ax-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-13 2150  ax-14 2151  ax-ext 2159  ax-sep 4121  ax-pow 4174  ax-pr 4209  ax-un 4433  ax-setind 4536  ax-cnex 7901  ax-resscn 7902  ax-pre-ltirr 7922  ax-pre-ltwlin 7923  ax-pre-lttrn 7924
This theorem depends on definitions:  df-bi 117  df-3or 979  df-3an 980  df-tru 1356  df-fal 1359  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ne 2348  df-nel 2443  df-ral 2460  df-rex 2461  df-rab 2464  df-v 2739  df-dif 3131  df-un 3133  df-in 3135  df-ss 3142  df-pw 3577  df-sn 3598  df-pr 3599  df-op 3601  df-uni 3810  df-br 4004  df-opab 4065  df-po 4296  df-iso 4297  df-xp 4632  df-cnv 4634  df-pnf 7992  df-mnf 7993  df-xr 7994  df-ltxr 7995  df-le 7996
This theorem is referenced by:  xrletrd  9810  xle2add  9877  icc0r  9924  iccss  9939  icossico  9941  iccss2  9942  iccssico  9943  bdxmet  13894
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