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Theorem xrlttrd 9901
Description: Transitive law for ordering on extended reals. (Contributed by Mario Carneiro, 23-Aug-2015.)
Hypotheses
Ref Expression
xrlttrd.1  |-  ( ph  ->  A  e.  RR* )
xrlttrd.2  |-  ( ph  ->  B  e.  RR* )
xrlttrd.3  |-  ( ph  ->  C  e.  RR* )
xrlttrd.4  |-  ( ph  ->  A  <  B )
xrlttrd.5  |-  ( ph  ->  B  <  C )
Assertion
Ref Expression
xrlttrd  |-  ( ph  ->  A  <  C )

Proof of Theorem xrlttrd
StepHypRef Expression
1 xrlttrd.4 . 2  |-  ( ph  ->  A  <  B )
2 xrlttrd.5 . 2  |-  ( ph  ->  B  <  C )
3 xrlttrd.1 . . 3  |-  ( ph  ->  A  e.  RR* )
4 xrlttrd.2 . . 3  |-  ( ph  ->  B  e.  RR* )
5 xrlttrd.3 . . 3  |-  ( ph  ->  C  e.  RR* )
6 xrlttr 9887 . . 3  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  (
( A  <  B  /\  B  <  C )  ->  A  <  C
) )
73, 4, 5, 6syl3anc 1249 . 2  |-  ( ph  ->  ( ( A  < 
B  /\  B  <  C )  ->  A  <  C ) )
81, 2, 7mp2and 433 1  |-  ( ph  ->  A  <  C )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    e. wcel 2167   class class class wbr 4034   RR*cxr 8077    < clt 8078
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 615  ax-in2 616  ax-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-13 2169  ax-14 2170  ax-ext 2178  ax-sep 4152  ax-pow 4208  ax-pr 4243  ax-un 4469  ax-setind 4574  ax-cnex 7987  ax-resscn 7988  ax-pre-lttrn 8010
This theorem depends on definitions:  df-bi 117  df-3or 981  df-3an 982  df-tru 1367  df-fal 1370  df-nf 1475  df-sb 1777  df-eu 2048  df-mo 2049  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-ne 2368  df-nel 2463  df-ral 2480  df-rex 2481  df-rab 2484  df-v 2765  df-dif 3159  df-un 3161  df-in 3163  df-ss 3170  df-pw 3608  df-sn 3629  df-pr 3630  df-op 3632  df-uni 3841  df-br 4035  df-opab 4096  df-xp 4670  df-pnf 8080  df-mnf 8081  df-xr 8082  df-ltxr 8083
This theorem is referenced by:  xlt2add  9972  ioom  10367
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