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

Theorem ltso 8367
Description: 'Less than' is a strict ordering. (Contributed by NM, 19-Jan-1997.)
Assertion
Ref Expression
ltso  |-  <  Or  RR

Proof of Theorem ltso
Dummy variables  x  y  z are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 ltnr 8366 . . . . 5  |-  ( x  e.  RR  ->  -.  x  <  x )
21adantl 277 . . . 4  |-  ( ( T.  /\  x  e.  RR )  ->  -.  x  <  x )
3 lttr 8363 . . . . 5  |-  ( ( x  e.  RR  /\  y  e.  RR  /\  z  e.  RR )  ->  (
( x  <  y  /\  y  <  z )  ->  x  <  z
) )
43adantl 277 . . . 4  |-  ( ( T.  /\  ( x  e.  RR  /\  y  e.  RR  /\  z  e.  RR ) )  -> 
( ( x  < 
y  /\  y  <  z )  ->  x  <  z ) )
52, 4ispod 4430 . . 3  |-  ( T. 
->  <  Po  RR )
65mptru 1407 . 2  |-  <  Po  RR
7 axltwlin 8357 . . 3  |-  ( ( x  e.  RR  /\  y  e.  RR  /\  z  e.  RR )  ->  (
x  <  y  ->  ( x  <  z  \/  z  <  y ) ) )
87rgen3 2631 . 2  |-  A. x  e.  RR  A. y  e.  RR  A. z  e.  RR  ( x  < 
y  ->  ( x  <  z  \/  z  < 
y ) )
9 df-iso 4423 . 2  |-  (  < 
Or  RR  <->  (  <  Po  RR  /\  A. x  e.  RR  A. y  e.  RR  A. z  e.  RR  ( x  < 
y  ->  ( x  <  z  \/  z  < 
y ) ) ) )
106, 8, 9mpbir2an 951 1  |-  <  Or  RR
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 104    \/ wo 716    /\ w3a 1005   T. wtru 1399    e. wcel 2205   A.wral 2522   class class class wbr 4114    Po wpo 4420    Or wor 4421   RRcr 8142    < clt 8324
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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-sep 4233  ax-pow 4292  ax-pr 4327  ax-un 4559  ax-setind 4664  ax-cnex 8234  ax-resscn 8235  ax-pre-ltirr 8255  ax-pre-ltwlin 8256  ax-pre-lttrn 8257
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-nel 2510  df-ral 2527  df-rex 2528  df-rab 2531  df-v 2817  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-br 4115  df-opab 4177  df-po 4422  df-iso 4423  df-xp 4760  df-pnf 8326  df-mnf 8327  df-ltxr 8329
This theorem is referenced by:  gtso  8368  ltnsym2  8380  suprlubex  9243  fimaxq  11219
  Copyright terms: Public domain W3C validator