MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  issod Unicode version

Theorem issod 4447
Description: An irreflexive, transitive, linear relation is a strict ordering. (Contributed by NM, 21-Jan-1996.) (Revised by Mario Carneiro, 9-Jul-2014.)
Hypotheses
Ref Expression
issod.1  |-  ( ph  ->  R  Po  A )
issod.2  |-  ( (
ph  /\  ( x  e.  A  /\  y  e.  A ) )  -> 
( x R y  \/  x  =  y  \/  y R x ) )
Assertion
Ref Expression
issod  |-  ( ph  ->  R  Or  A )
Distinct variable groups:    x, y, R    x, A, y    ph, x, y

Proof of Theorem issod
StepHypRef Expression
1 issod.1 . 2  |-  ( ph  ->  R  Po  A )
2 issod.2 . . 3  |-  ( (
ph  /\  ( x  e.  A  /\  y  e.  A ) )  -> 
( x R y  \/  x  =  y  \/  y R x ) )
32ralrimivva 2720 . 2  |-  ( ph  ->  A. x  e.  A  A. y  e.  A  ( x R y  \/  x  =  y  \/  y R x ) )
4 df-so 4418 . 2  |-  ( R  Or  A  <->  ( R  Po  A  /\  A. x  e.  A  A. y  e.  A  ( x R y  \/  x  =  y  \/  y R x ) ) )
51, 3, 4sylanbrc 645 1  |-  ( ph  ->  R  Or  A )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 358    \/ w3o 934    = wceq 1647    e. wcel 1715   A.wral 2628   class class class wbr 4125    Po wpo 4415    Or wor 4416
This theorem is referenced by:  issoi  4448  swoso  6833  wemapso2lem  7412
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1551  ax-5 1562  ax-17 1621  ax-9 1659  ax-8 1680  ax-11 1751
This theorem depends on definitions:  df-bi 177  df-an 360  df-ex 1547  df-nf 1550  df-ral 2633  df-so 4418
  Copyright terms: Public domain W3C validator