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Theorem hlhgt4 36629
Description: A Hilbert lattice has a height of at least 4. (Contributed by NM, 4-Dec-2011.)
Hypotheses
Ref Expression
hlhgt4.b 𝐵 = (Base‘𝐾)
hlhgt4.s < = (lt‘𝐾)
hlhgt4.z 0 = (0.‘𝐾)
hlhgt4.u 1 = (1.‘𝐾)
Assertion
Ref Expression
hlhgt4 (𝐾 ∈ HL → ∃𝑥𝐵𝑦𝐵𝑧𝐵 (( 0 < 𝑥𝑥 < 𝑦) ∧ (𝑦 < 𝑧𝑧 < 1 )))
Distinct variable groups:   𝑥,𝑦,𝑧,𝐵   𝑥,𝐾,𝑦,𝑧
Allowed substitution hints:   < (𝑥,𝑦,𝑧)   1 (𝑥,𝑦,𝑧)   0 (𝑥,𝑦,𝑧)

Proof of Theorem hlhgt4
StepHypRef Expression
1 hlhgt4.b . . 3 𝐵 = (Base‘𝐾)
2 eqid 2824 . . 3 (le‘𝐾) = (le‘𝐾)
3 hlhgt4.s . . 3 < = (lt‘𝐾)
4 eqid 2824 . . 3 (join‘𝐾) = (join‘𝐾)
5 hlhgt4.z . . 3 0 = (0.‘𝐾)
6 hlhgt4.u . . 3 1 = (1.‘𝐾)
7 eqid 2824 . . 3 (Atoms‘𝐾) = (Atoms‘𝐾)
81, 2, 3, 4, 5, 6, 7ishlat2 36594 . 2 (𝐾 ∈ HL ↔ ((𝐾 ∈ OML ∧ 𝐾 ∈ CLat ∧ 𝐾 ∈ AtLat) ∧ (∀𝑥 ∈ (Atoms‘𝐾)∀𝑦 ∈ (Atoms‘𝐾)((𝑥𝑦 → ∃𝑧 ∈ (Atoms‘𝐾)(𝑧𝑥𝑧𝑦𝑧(le‘𝐾)(𝑥(join‘𝐾)𝑦))) ∧ ∀𝑧𝐵 ((¬ 𝑥(le‘𝐾)𝑧𝑥(le‘𝐾)(𝑧(join‘𝐾)𝑦)) → 𝑦(le‘𝐾)(𝑧(join‘𝐾)𝑥))) ∧ ∃𝑥𝐵𝑦𝐵𝑧𝐵 (( 0 < 𝑥𝑥 < 𝑦) ∧ (𝑦 < 𝑧𝑧 < 1 )))))
9 simprr 772 . 2 (((𝐾 ∈ OML ∧ 𝐾 ∈ CLat ∧ 𝐾 ∈ AtLat) ∧ (∀𝑥 ∈ (Atoms‘𝐾)∀𝑦 ∈ (Atoms‘𝐾)((𝑥𝑦 → ∃𝑧 ∈ (Atoms‘𝐾)(𝑧𝑥𝑧𝑦𝑧(le‘𝐾)(𝑥(join‘𝐾)𝑦))) ∧ ∀𝑧𝐵 ((¬ 𝑥(le‘𝐾)𝑧𝑥(le‘𝐾)(𝑧(join‘𝐾)𝑦)) → 𝑦(le‘𝐾)(𝑧(join‘𝐾)𝑥))) ∧ ∃𝑥𝐵𝑦𝐵𝑧𝐵 (( 0 < 𝑥𝑥 < 𝑦) ∧ (𝑦 < 𝑧𝑧 < 1 )))) → ∃𝑥𝐵𝑦𝐵𝑧𝐵 (( 0 < 𝑥𝑥 < 𝑦) ∧ (𝑦 < 𝑧𝑧 < 1 )))
108, 9sylbi 220 1 (𝐾 ∈ HL → ∃𝑥𝐵𝑦𝐵𝑧𝐵 (( 0 < 𝑥𝑥 < 𝑦) ∧ (𝑦 < 𝑧𝑧 < 1 )))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 399  w3a 1084   = wceq 1538  wcel 2115  wne 3014  wral 3133  wrex 3134   class class class wbr 5052  cfv 6343  (class class class)co 7149  Basecbs 16483  lecple 16572  ltcplt 17551  joincjn 17554  0.cp0 17647  1.cp1 17648  CLatccla 17717  OMLcoml 36416  Atomscatm 36504  AtLatcal 36505  HLchlt 36591
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1971  ax-7 2016  ax-8 2117  ax-9 2125  ax-10 2146  ax-11 2162  ax-12 2179  ax-ext 2796
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2071  df-clab 2803  df-cleq 2817  df-clel 2896  df-nfc 2964  df-ral 3138  df-rex 3139  df-rab 3142  df-v 3482  df-un 3924  df-in 3926  df-ss 3936  df-sn 4551  df-pr 4553  df-op 4557  df-uni 4825  df-br 5053  df-iota 6302  df-fv 6351  df-ov 7152  df-cvlat 36563  df-hlat 36592
This theorem is referenced by:  hlhgt2  36630  athgt  36697
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