ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  xrletrid Unicode version

Theorem xrletrid 10013
Description: Trichotomy law for extended reals. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
Hypotheses
Ref Expression
xrletrid.1  |-  ( ph  ->  A  e.  RR* )
xrletrid.2  |-  ( ph  ->  B  e.  RR* )
xrletrid.3  |-  ( ph  ->  A  <_  B )
xrletrid.4  |-  ( ph  ->  B  <_  A )
Assertion
Ref Expression
xrletrid  |-  ( ph  ->  A  =  B )

Proof of Theorem xrletrid
StepHypRef Expression
1 xrletrid.3 . 2  |-  ( ph  ->  A  <_  B )
2 xrletrid.4 . 2  |-  ( ph  ->  B  <_  A )
3 xrletrid.1 . . 3  |-  ( ph  ->  A  e.  RR* )
4 xrletrid.2 . . 3  |-  ( ph  ->  B  e.  RR* )
5 xrletri3 10012 . . 3  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  ( A  =  B  <->  ( A  <_  B  /\  B  <_  A ) ) )
63, 4, 5syl2anc 411 . 2  |-  ( ph  ->  ( A  =  B  <-> 
( A  <_  B  /\  B  <_  A ) ) )
71, 2, 6mpbir2and 950 1  |-  ( ph  ->  A  =  B )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    <-> wb 105    = wceq 1395    e. wcel 2200   class class class wbr 4083   RR*cxr 8191    <_ cle 8193
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 8101  ax-resscn 8102  ax-pre-ltirr 8122  ax-pre-apti 8125
This theorem depends on definitions:  df-bi 117  df-3or 1003  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 8194  df-mnf 8195  df-xr 8196  df-ltxr 8197  df-le 8198
This theorem is referenced by:  pcadd2  12879
  Copyright terms: Public domain W3C validator