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Theorem ltletri 8253
Description: 'Less than', 'less than or equal to' transitive law. (Contributed by NM, 14-May-1999.)
Hypotheses
Ref Expression
lt.1  |-  A  e.  RR
lt.2  |-  B  e.  RR
lt.3  |-  C  e.  RR
Assertion
Ref Expression
ltletri  |-  ( ( A  <  B  /\  B  <_  C )  ->  A  <  C )

Proof of Theorem ltletri
StepHypRef Expression
1 lt.1 . 2  |-  A  e.  RR
2 lt.2 . 2  |-  B  e.  RR
3 lt.3 . 2  |-  C  e.  RR
4 ltletr 8236 . 2  |-  ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  ->  (
( A  <  B  /\  B  <_  C )  ->  A  <  C
) )
51, 2, 3, 4mp3an 1371 1  |-  ( ( A  <  B  /\  B  <_  C )  ->  A  <  C )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    e. wcel 2200   class class class wbr 4083   RRcr 7998    < clt 8181    <_ cle 8182
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 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-sep 4202  ax-pow 4258  ax-pr 4293  ax-un 4524  ax-setind 4629  ax-cnex 8090  ax-resscn 8091  ax-pre-ltwlin 8112
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-nel 2496  df-ral 2513  df-rex 2514  df-rab 2517  df-v 2801  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3889  df-br 4084  df-opab 4146  df-xp 4725  df-cnv 4727  df-pnf 8183  df-mnf 8184  df-xr 8185  df-ltxr 8186  df-le 8187
This theorem is referenced by:  numltc  9603  ef01bndlem  12267
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