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Theorem lelttr 8414
Description: Transitive law. Part of Definition 11.2.7(vi) of [HoTT], p. (varies). (Contributed by NM, 23-May-1999.)
Assertion
Ref Expression
lelttr  |-  ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  ->  (
( A  <_  B  /\  B  <  C )  ->  A  <  C
) )

Proof of Theorem lelttr
StepHypRef Expression
1 simprl 535 . . . . 5  |-  ( ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  /\  ( A  <_  B  /\  B  <  C ) )  ->  A  <_  B )
2 simpl1 1031 . . . . . 6  |-  ( ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  /\  ( A  <_  B  /\  B  <  C ) )  ->  A  e.  RR )
3 simpl2 1032 . . . . . 6  |-  ( ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  /\  ( A  <_  B  /\  B  <  C ) )  ->  B  e.  RR )
4 lenlt 8401 . . . . . 6  |-  ( ( A  e.  RR  /\  B  e.  RR )  ->  ( A  <_  B  <->  -.  B  <  A ) )
52, 3, 4syl2anc 415 . . . . 5  |-  ( ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  /\  ( A  <_  B  /\  B  <  C ) )  ->  ( A  <_  B  <->  -.  B  <  A ) )
61, 5mpbid 147 . . . 4  |-  ( ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  /\  ( A  <_  B  /\  B  <  C ) )  ->  -.  B  <  A )
76pm2.21d 628 . . 3  |-  ( ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  /\  ( A  <_  B  /\  B  <  C ) )  ->  ( B  <  A  ->  A  <  C ) )
8 idd 21 . . 3  |-  ( ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  /\  ( A  <_  B  /\  B  <  C ) )  ->  ( A  <  C  ->  A  <  C ) )
9 simprr 537 . . . 4  |-  ( ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  /\  ( A  <_  B  /\  B  <  C ) )  ->  B  <  C )
10 simpl3 1033 . . . . 5  |-  ( ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  /\  ( A  <_  B  /\  B  <  C ) )  ->  C  e.  RR )
11 axltwlin 8393 . . . . 5  |-  ( ( B  e.  RR  /\  C  e.  RR  /\  A  e.  RR )  ->  ( B  <  C  ->  ( B  <  A  \/  A  <  C ) ) )
123, 10, 2, 11syl3anc 1278 . . . 4  |-  ( ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  /\  ( A  <_  B  /\  B  <  C ) )  ->  ( B  <  C  ->  ( B  <  A  \/  A  < 
C ) ) )
139, 12mpd 13 . . 3  |-  ( ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  /\  ( A  <_  B  /\  B  <  C ) )  ->  ( B  <  A  \/  A  < 
C ) )
147, 8, 13mpjaod 730 . 2  |-  ( ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  /\  ( A  <_  B  /\  B  <  C ) )  ->  A  <  C )
1514ex 115 1  |-  ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  ->  (
( A  <_  B  /\  B  <  C )  ->  A  <  C
) )
Colors of variables:    wff set class
This proof depends on syntax axioms:   -. wn 3    -> wi 4    /\ wa 104    <-> wb 105    \/ wo 720    /\ w3a 1009    e. wcel 2209   class class class wbr 4130   RRcr 8178    < clt 8360    <_ cle 8361
This proof depends on 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 4249  ax-pow 4311  ax-pr 4346  ax-un 4578  ax-setind 4684  ax-cnex 8270  ax-resscn 8271  ax-pre-ltwlin 8292
This proof depends on definitions:  df-bi 117  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-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-br 4131  df-opab 4193  df-xp 4780  df-cnv 4782  df-pnf 8362  df-mnf 8363  df-xr 8364  df-ltxr 8365  df-le 8366
This theorem is used by:  lelttri  8431  lelttrd  8451  letrp1  9178  ltmul12a  9190  bndndx  9562  uzind  9757  fnn0ind  9762  nn0p1elfzo  10594  elfzo0z  10596  fzofzim  10600  elfzodifsumelfzo  10619  flqge  10717  modfzo0difsn  10832  expnlbnd2  11103  ccat2s1fvwd  11415  swrdswrd  11477  pfxccatin12lem3  11504  caubnd2  11883  mulcn2  12078  cn1lem  12080  climsqz  12101  climsqz2  12102  climcvg1nlem  12115  ltoddhalfle  12660  algcvgblem  12827  pclemub  13066  metss2lem  15598  logdivlti  15982  gausslemma2dlem2  16181  lealltlt2  16752
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