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Theorem xrlttrd 9966
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 9952 . . 3  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  (
( A  <  B  /\  B  <  C )  ->  A  <  C
) )
73, 4, 5, 6syl3anc 1250 . 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 2178   class class class wbr 4059   RR*cxr 8141    < clt 8142
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 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-13 2180  ax-14 2181  ax-ext 2189  ax-sep 4178  ax-pow 4234  ax-pr 4269  ax-un 4498  ax-setind 4603  ax-cnex 8051  ax-resscn 8052  ax-pre-lttrn 8074
This theorem depends on definitions:  df-bi 117  df-3or 982  df-3an 983  df-tru 1376  df-fal 1379  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2194  df-cleq 2200  df-clel 2203  df-nfc 2339  df-ne 2379  df-nel 2474  df-ral 2491  df-rex 2492  df-rab 2495  df-v 2778  df-dif 3176  df-un 3178  df-in 3180  df-ss 3187  df-pw 3628  df-sn 3649  df-pr 3650  df-op 3652  df-uni 3865  df-br 4060  df-opab 4122  df-xp 4699  df-pnf 8144  df-mnf 8145  df-xr 8146  df-ltxr 8147
This theorem is referenced by:  xlt2add  10037  ioom  10440
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