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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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