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Theorem xrletr 9744
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 9732 . . . . . 6  |-  <  Or  RR*
2 sowlin 4298 . . . . . 6  |-  ( (  <  Or  RR*  /\  ( C  e.  RR*  /\  A  e.  RR*  /\  B  e. 
RR* ) )  -> 
( C  <  A  ->  ( C  <  B  \/  B  <  A ) ) )
31, 2mpan 421 . . . . 5  |-  ( ( C  e.  RR*  /\  A  e.  RR*  /\  B  e. 
RR* )  ->  ( C  <  A  ->  ( C  <  B  \/  B  <  A ) ) )
433coml 1200 . . . 4  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  ( C  <  A  ->  ( C  <  B  \/  B  <  A ) ) )
5 orcom 718 . . . 4  |-  ( ( C  <  B  \/  B  <  A )  <->  ( B  <  A  \/  C  < 
B ) )
64, 5syl6ib 160 . . 3  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  ( C  <  A  ->  ( B  <  A  \/  C  <  B ) ) )
76con3d 621 . 2  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  ( -.  ( B  <  A  \/  C  <  B )  ->  -.  C  <  A ) )
8 xrlenlt 7963 . . . . 5  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  ( A  <_  B  <->  -.  B  <  A ) )
983adant3 1007 . . . 4  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  ( A  <_  B  <->  -.  B  <  A ) )
10 xrlenlt 7963 . . . . 5  |-  ( ( B  e.  RR*  /\  C  e.  RR* )  ->  ( B  <_  C  <->  -.  C  <  B ) )
11103adant1 1005 . . . 4  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  ( B  <_  C  <->  -.  C  <  B ) )
129, 11anbi12d 465 . . 3  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  (
( A  <_  B  /\  B  <_  C )  <-> 
( -.  B  < 
A  /\  -.  C  <  B ) ) )
13 ioran 742 . . 3  |-  ( -.  ( B  <  A  \/  C  <  B )  <-> 
( -.  B  < 
A  /\  -.  C  <  B ) )
1412, 13bitr4di 197 . 2  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  (
( A  <_  B  /\  B  <_  C )  <->  -.  ( B  <  A  \/  C  <  B ) ) )
15 xrlenlt 7963 . . 3  |-  ( ( A  e.  RR*  /\  C  e.  RR* )  ->  ( A  <_  C  <->  -.  C  <  A ) )
16153adant2 1006 . 2  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  ( A  <_  C  <->  -.  C  <  A ) )
177, 14, 163imtr4d 202 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 103    <-> wb 104    \/ wo 698    /\ w3a 968    e. wcel 2136   class class class wbr 3982    Or wor 4273   RR*cxr 7932    < clt 7933    <_ cle 7934
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-13 2138  ax-14 2139  ax-ext 2147  ax-sep 4100  ax-pow 4153  ax-pr 4187  ax-un 4411  ax-setind 4514  ax-cnex 7844  ax-resscn 7845  ax-pre-ltirr 7865  ax-pre-ltwlin 7866  ax-pre-lttrn 7867
This theorem depends on definitions:  df-bi 116  df-3or 969  df-3an 970  df-tru 1346  df-fal 1349  df-nf 1449  df-sb 1751  df-eu 2017  df-mo 2018  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ne 2337  df-nel 2432  df-ral 2449  df-rex 2450  df-rab 2453  df-v 2728  df-dif 3118  df-un 3120  df-in 3122  df-ss 3129  df-pw 3561  df-sn 3582  df-pr 3583  df-op 3585  df-uni 3790  df-br 3983  df-opab 4044  df-po 4274  df-iso 4275  df-xp 4610  df-cnv 4612  df-pnf 7935  df-mnf 7936  df-xr 7937  df-ltxr 7938  df-le 7939
This theorem is referenced by:  xrletrd  9748  xle2add  9815  icc0r  9862  iccss  9877  icossico  9879  iccss2  9880  iccssico  9881  bdxmet  13141
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