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Theorem latnlej 17670
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 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵) ∧ ¬ 𝑋 (𝑌 𝑍)) → (𝑋𝑌𝑋𝑍))

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 17662 . . . . . 6 ((𝐾 ∈ Lat ∧ 𝑌𝐵𝑍𝐵) → 𝑌 (𝑌 𝑍))
543adant3r1 1176 . . . . 5 ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → 𝑌 (𝑌 𝑍))
6 breq1 5065 . . . . 5 (𝑋 = 𝑌 → (𝑋 (𝑌 𝑍) ↔ 𝑌 (𝑌 𝑍)))
75, 6syl5ibrcom 248 . . . 4 ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 = 𝑌𝑋 (𝑌 𝑍)))
87necon3bd 3034 . . 3 ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (¬ 𝑋 (𝑌 𝑍) → 𝑋𝑌))
91, 2, 3latlej2 17663 . . . . . 6 ((𝐾 ∈ Lat ∧ 𝑌𝐵𝑍𝐵) → 𝑍 (𝑌 𝑍))
1093adant3r1 1176 . . . . 5 ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → 𝑍 (𝑌 𝑍))
11 breq1 5065 . . . . 5 (𝑋 = 𝑍 → (𝑋 (𝑌 𝑍) ↔ 𝑍 (𝑌 𝑍)))
1210, 11syl5ibrcom 248 . . . 4 ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 = 𝑍𝑋 (𝑌 𝑍)))
1312necon3bd 3034 . . 3 ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (¬ 𝑋 (𝑌 𝑍) → 𝑋𝑍))
148, 13jcad 513 . 2 ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (¬ 𝑋 (𝑌 𝑍) → (𝑋𝑌𝑋𝑍)))
15143impia 1111 1 ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵) ∧ ¬ 𝑋 (𝑌 𝑍)) → (𝑋𝑌𝑋𝑍))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 396  w3a 1081   = wceq 1530  wcel 2106  wne 3020   class class class wbr 5062  cfv 6351  (class class class)co 7151  Basecbs 16475  lecple 16564  joincjn 17546  Latclat 17647
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1904  ax-6 1963  ax-7 2008  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2152  ax-12 2167  ax-ext 2796  ax-rep 5186  ax-sep 5199  ax-nul 5206  ax-pow 5262  ax-pr 5325  ax-un 7454
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 844  df-3an 1083  df-tru 1533  df-ex 1774  df-nf 1778  df-sb 2063  df-mo 2615  df-eu 2649  df-clab 2803  df-cleq 2817  df-clel 2897  df-nfc 2967  df-ne 3021  df-ral 3147  df-rex 3148  df-reu 3149  df-rab 3151  df-v 3501  df-sbc 3776  df-csb 3887  df-dif 3942  df-un 3944  df-in 3946  df-ss 3955  df-nul 4295  df-if 4470  df-pw 4543  df-sn 4564  df-pr 4566  df-op 4570  df-uni 4837  df-iun 4918  df-br 5063  df-opab 5125  df-mpt 5143  df-id 5458  df-xp 5559  df-rel 5560  df-cnv 5561  df-co 5562  df-dm 5563  df-rn 5564  df-res 5565  df-ima 5566  df-iota 6311  df-fun 6353  df-fn 6354  df-f 6355  df-f1 6356  df-fo 6357  df-f1o 6358  df-fv 6359  df-riota 7109  df-ov 7154  df-oprab 7155  df-lub 17576  df-join 17578  df-lat 17648
This theorem is referenced by:  latnlej1l  17671  latnlej1r  17672
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