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Theorem latnlej 17008
 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 17000 . . . . . 6 ((𝐾 ∈ Lat ∧ 𝑌𝐵𝑍𝐵) → 𝑌 (𝑌 𝑍))
543adant3r1 1271 . . . . 5 ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → 𝑌 (𝑌 𝑍))
6 breq1 4626 . . . . 5 (𝑋 = 𝑌 → (𝑋 (𝑌 𝑍) ↔ 𝑌 (𝑌 𝑍)))
75, 6syl5ibrcom 237 . . . 4 ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 = 𝑌𝑋 (𝑌 𝑍)))
87necon3bd 2804 . . 3 ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (¬ 𝑋 (𝑌 𝑍) → 𝑋𝑌))
91, 2, 3latlej2 17001 . . . . . 6 ((𝐾 ∈ Lat ∧ 𝑌𝐵𝑍𝐵) → 𝑍 (𝑌 𝑍))
1093adant3r1 1271 . . . . 5 ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → 𝑍 (𝑌 𝑍))
11 breq1 4626 . . . . 5 (𝑋 = 𝑍 → (𝑋 (𝑌 𝑍) ↔ 𝑍 (𝑌 𝑍)))
1210, 11syl5ibrcom 237 . . . 4 ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 = 𝑍𝑋 (𝑌 𝑍)))
1312necon3bd 2804 . . 3 ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (¬ 𝑋 (𝑌 𝑍) → 𝑋𝑍))
148, 13jcad 555 . 2 ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (¬ 𝑋 (𝑌 𝑍) → (𝑋𝑌𝑋𝑍)))
15143impia 1258 1 ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵) ∧ ¬ 𝑋 (𝑌 𝑍)) → (𝑋𝑌𝑋𝑍))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 384   ∧ w3a 1036   = wceq 1480   ∈ wcel 1987   ≠ wne 2790   class class class wbr 4623  ‘cfv 5857  (class class class)co 6615  Basecbs 15800  lecple 15888  joincjn 16884  Latclat 16985 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-rep 4741  ax-sep 4751  ax-nul 4759  ax-pow 4813  ax-pr 4877  ax-un 6914 This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ne 2791  df-ral 2913  df-rex 2914  df-reu 2915  df-rab 2917  df-v 3192  df-sbc 3423  df-csb 3520  df-dif 3563  df-un 3565  df-in 3567  df-ss 3574  df-nul 3898  df-if 4065  df-pw 4138  df-sn 4156  df-pr 4158  df-op 4162  df-uni 4410  df-iun 4494  df-br 4624  df-opab 4684  df-mpt 4685  df-id 4999  df-xp 5090  df-rel 5091  df-cnv 5092  df-co 5093  df-dm 5094  df-rn 5095  df-res 5096  df-ima 5097  df-iota 5820  df-fun 5859  df-fn 5860  df-f 5861  df-f1 5862  df-fo 5863  df-f1o 5864  df-fv 5865  df-riota 6576  df-ov 6618  df-oprab 6619  df-lub 16914  df-join 16916  df-lat 16986 This theorem is referenced by:  latnlej1l  17009  latnlej1r  17010
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