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Theorem soirri 4941
Description: A strict order relation is irreflexive. (Contributed by NM, 10-Feb-1996.) (Revised by Mario Carneiro, 10-May-2013.)
Hypotheses
Ref Expression
soi.1  |-  R  Or  S
soi.2  |-  R  C_  ( S  X.  S
)
Assertion
Ref Expression
soirri  |-  -.  A R A

Proof of Theorem soirri
StepHypRef Expression
1 id 19 . 2  |-  ( A R A  ->  A R A )
2 soi.1 . . 3  |-  R  Or  S
3 soi.2 . . . . 5  |-  R  C_  ( S  X.  S
)
43brel 4599 . . . 4  |-  ( A R A  ->  ( A  e.  S  /\  A  e.  S )
)
54simpld 111 . . 3  |-  ( A R A  ->  A  e.  S )
6 sonr 4247 . . 3  |-  ( ( R  Or  S  /\  A  e.  S )  ->  -.  A R A )
72, 5, 6sylancr 411 . 2  |-  ( A R A  ->  -.  A R A )
81, 7pm2.65i 629 1  |-  -.  A R A
Colors of variables: wff set class
Syntax hints:   -. wn 3    e. wcel 1481    C_ wss 3076   class class class wbr 3937    Or wor 4225    X. cxp 4545
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1483  ax-10 1484  ax-11 1485  ax-i12 1486  ax-bndl 1487  ax-4 1488  ax-14 1493  ax-17 1507  ax-i9 1511  ax-ial 1515  ax-i5r 1516  ax-ext 2122  ax-sep 4054  ax-pow 4106  ax-pr 4139
This theorem depends on definitions:  df-bi 116  df-3an 965  df-tru 1335  df-nf 1438  df-sb 1737  df-clab 2127  df-cleq 2133  df-clel 2136  df-nfc 2271  df-ral 2422  df-rex 2423  df-v 2691  df-un 3080  df-in 3082  df-ss 3089  df-pw 3517  df-sn 3538  df-pr 3539  df-op 3541  df-br 3938  df-opab 3998  df-po 4226  df-iso 4227  df-xp 4553
This theorem is referenced by:  son2lpi  4943  ltsonq  7230  genpdisj  7355  ltposr  7595  axpre-ltirr  7714
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