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Theorem latnlej 15544
Description: An idiom to express that a lattice element differs from two others. (Contributed by NM, 28-May-2012.)
Hypotheses
Ref Expression
latlej.b  |-  B  =  ( Base `  K
)
latlej.l  |-  .<_  =  ( le `  K )
latlej.j  |-  .\/  =  ( join `  K )
Assertion
Ref Expression
latnlej  |-  ( ( K  e.  Lat  /\  ( X  e.  B  /\  Y  e.  B  /\  Z  e.  B
)  /\  -.  X  .<_  ( Y  .\/  Z
) )  ->  ( X  =/=  Y  /\  X  =/=  Z ) )

Proof of Theorem latnlej
StepHypRef Expression
1 latlej.b . . . . . . 7  |-  B  =  ( Base `  K
)
2 latlej.l . . . . . . 7  |-  .<_  =  ( le `  K )
3 latlej.j . . . . . . 7  |-  .\/  =  ( join `  K )
41, 2, 3latlej1 15536 . . . . . 6  |-  ( ( K  e.  Lat  /\  Y  e.  B  /\  Z  e.  B )  ->  Y  .<_  ( Y  .\/  Z ) )
543adant3r1 1200 . . . . 5  |-  ( ( K  e.  Lat  /\  ( X  e.  B  /\  Y  e.  B  /\  Z  e.  B
) )  ->  Y  .<_  ( Y  .\/  Z
) )
6 breq1 4443 . . . . 5  |-  ( X  =  Y  ->  ( X  .<_  ( Y  .\/  Z )  <->  Y  .<_  ( Y 
.\/  Z ) ) )
75, 6syl5ibrcom 222 . . . 4  |-  ( ( K  e.  Lat  /\  ( X  e.  B  /\  Y  e.  B  /\  Z  e.  B
) )  ->  ( X  =  Y  ->  X 
.<_  ( Y  .\/  Z
) ) )
87necon3bd 2672 . . 3  |-  ( ( K  e.  Lat  /\  ( X  e.  B  /\  Y  e.  B  /\  Z  e.  B
) )  ->  ( -.  X  .<_  ( Y 
.\/  Z )  ->  X  =/=  Y ) )
91, 2, 3latlej2 15537 . . . . . 6  |-  ( ( K  e.  Lat  /\  Y  e.  B  /\  Z  e.  B )  ->  Z  .<_  ( Y  .\/  Z ) )
1093adant3r1 1200 . . . . 5  |-  ( ( K  e.  Lat  /\  ( X  e.  B  /\  Y  e.  B  /\  Z  e.  B
) )  ->  Z  .<_  ( Y  .\/  Z
) )
11 breq1 4443 . . . . 5  |-  ( X  =  Z  ->  ( X  .<_  ( Y  .\/  Z )  <->  Z  .<_  ( Y 
.\/  Z ) ) )
1210, 11syl5ibrcom 222 . . . 4  |-  ( ( K  e.  Lat  /\  ( X  e.  B  /\  Y  e.  B  /\  Z  e.  B
) )  ->  ( X  =  Z  ->  X 
.<_  ( Y  .\/  Z
) ) )
1312necon3bd 2672 . . 3  |-  ( ( K  e.  Lat  /\  ( X  e.  B  /\  Y  e.  B  /\  Z  e.  B
) )  ->  ( -.  X  .<_  ( Y 
.\/  Z )  ->  X  =/=  Z ) )
148, 13jcad 533 . 2  |-  ( ( K  e.  Lat  /\  ( X  e.  B  /\  Y  e.  B  /\  Z  e.  B
) )  ->  ( -.  X  .<_  ( Y 
.\/  Z )  -> 
( X  =/=  Y  /\  X  =/=  Z
) ) )
15143impia 1188 1  |-  ( ( K  e.  Lat  /\  ( X  e.  B  /\  Y  e.  B  /\  Z  e.  B
)  /\  -.  X  .<_  ( Y  .\/  Z
) )  ->  ( X  =/=  Y  /\  X  =/=  Z ) )
Colors of variables: wff setvar class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 369    /\ w3a 968    = wceq 1374    e. wcel 1762    =/= wne 2655   class class class wbr 4440   ` cfv 5579  (class class class)co 6275   Basecbs 14479   lecple 14551   joincjn 15420   Latclat 15521
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1596  ax-4 1607  ax-5 1675  ax-6 1714  ax-7 1734  ax-8 1764  ax-9 1766  ax-10 1781  ax-11 1786  ax-12 1798  ax-13 1961  ax-ext 2438  ax-rep 4551  ax-sep 4561  ax-nul 4569  ax-pow 4618  ax-pr 4679  ax-un 6567
This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-3an 970  df-tru 1377  df-ex 1592  df-nf 1595  df-sb 1707  df-eu 2272  df-mo 2273  df-clab 2446  df-cleq 2452  df-clel 2455  df-nfc 2610  df-ne 2657  df-ral 2812  df-rex 2813  df-reu 2814  df-rab 2816  df-v 3108  df-sbc 3325  df-csb 3429  df-dif 3472  df-un 3474  df-in 3476  df-ss 3483  df-nul 3779  df-if 3933  df-pw 4005  df-sn 4021  df-pr 4023  df-op 4027  df-uni 4239  df-iun 4320  df-br 4441  df-opab 4499  df-mpt 4500  df-id 4788  df-xp 4998  df-rel 4999  df-cnv 5000  df-co 5001  df-dm 5002  df-rn 5003  df-res 5004  df-ima 5005  df-iota 5542  df-fun 5581  df-fn 5582  df-f 5583  df-f1 5584  df-fo 5585  df-f1o 5586  df-fv 5587  df-riota 6236  df-ov 6278  df-oprab 6279  df-lub 15450  df-join 15452  df-lat 15522
This theorem is referenced by:  latnlej1l  15545  latnlej1r  15546
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