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Theorem plttr 17238
Description: The less-than relation is transitive. (psstr 3872 analog.) (Contributed by NM, 2-Dec-2011.)
Hypotheses
Ref Expression
pltnlt.b 𝐵 = (Base‘𝐾)
pltnlt.s < = (lt‘𝐾)
Assertion
Ref Expression
plttr ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 < 𝑌𝑌 < 𝑍) → 𝑋 < 𝑍))

Proof of Theorem plttr
StepHypRef Expression
1 eqid 2765 . . . . . 6 (le‘𝐾) = (le‘𝐾)
2 pltnlt.s . . . . . 6 < = (lt‘𝐾)
31, 2pltle 17229 . . . . 5 ((𝐾 ∈ Poset ∧ 𝑋𝐵𝑌𝐵) → (𝑋 < 𝑌𝑋(le‘𝐾)𝑌))
433adant3r3 1235 . . . 4 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 < 𝑌𝑋(le‘𝐾)𝑌))
51, 2pltle 17229 . . . . 5 ((𝐾 ∈ Poset ∧ 𝑌𝐵𝑍𝐵) → (𝑌 < 𝑍𝑌(le‘𝐾)𝑍))
653adant3r1 1233 . . . 4 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑌 < 𝑍𝑌(le‘𝐾)𝑍))
7 pltnlt.b . . . . 5 𝐵 = (Base‘𝐾)
87, 1postr 17221 . . . 4 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋(le‘𝐾)𝑌𝑌(le‘𝐾)𝑍) → 𝑋(le‘𝐾)𝑍))
94, 6, 8syl2and 601 . . 3 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 < 𝑌𝑌 < 𝑍) → 𝑋(le‘𝐾)𝑍))
107, 2pltn2lp 17237 . . . . . 6 ((𝐾 ∈ Poset ∧ 𝑋𝐵𝑌𝐵) → ¬ (𝑋 < 𝑌𝑌 < 𝑋))
11103adant3r3 1235 . . . . 5 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ¬ (𝑋 < 𝑌𝑌 < 𝑋))
12 breq2 4813 . . . . . . 7 (𝑋 = 𝑍 → (𝑌 < 𝑋𝑌 < 𝑍))
1312anbi2d 622 . . . . . 6 (𝑋 = 𝑍 → ((𝑋 < 𝑌𝑌 < 𝑋) ↔ (𝑋 < 𝑌𝑌 < 𝑍)))
1413notbid 309 . . . . 5 (𝑋 = 𝑍 → (¬ (𝑋 < 𝑌𝑌 < 𝑋) ↔ ¬ (𝑋 < 𝑌𝑌 < 𝑍)))
1511, 14syl5ibcom 236 . . . 4 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 = 𝑍 → ¬ (𝑋 < 𝑌𝑌 < 𝑍)))
1615necon2ad 2952 . . 3 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 < 𝑌𝑌 < 𝑍) → 𝑋𝑍))
179, 16jcad 508 . 2 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 < 𝑌𝑌 < 𝑍) → (𝑋(le‘𝐾)𝑍𝑋𝑍)))
181, 2pltval 17228 . . 3 ((𝐾 ∈ Poset ∧ 𝑋𝐵𝑍𝐵) → (𝑋 < 𝑍 ↔ (𝑋(le‘𝐾)𝑍𝑋𝑍)))
19183adant3r2 1234 . 2 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 < 𝑍 ↔ (𝑋(le‘𝐾)𝑍𝑋𝑍)))
2017, 19sylibrd 250 1 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 < 𝑌𝑌 < 𝑍) → 𝑋 < 𝑍))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 197  wa 384  w3a 1107   = wceq 1652  wcel 2155  wne 2937   class class class wbr 4809  cfv 6068  Basecbs 16132  lecple 16223  Posetcpo 17208  ltcplt 17209
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1890  ax-4 1904  ax-5 2005  ax-6 2070  ax-7 2105  ax-9 2164  ax-10 2183  ax-11 2198  ax-12 2211  ax-13 2352  ax-ext 2743  ax-sep 4941  ax-nul 4949  ax-pr 5062
This theorem depends on definitions:  df-bi 198  df-an 385  df-or 874  df-3an 1109  df-tru 1656  df-ex 1875  df-nf 1879  df-sb 2063  df-mo 2565  df-eu 2582  df-clab 2752  df-cleq 2758  df-clel 2761  df-nfc 2896  df-ne 2938  df-ral 3060  df-rex 3061  df-rab 3064  df-v 3352  df-sbc 3597  df-dif 3735  df-un 3737  df-in 3739  df-ss 3746  df-nul 4080  df-if 4244  df-sn 4335  df-pr 4337  df-op 4341  df-uni 4595  df-br 4810  df-opab 4872  df-mpt 4889  df-id 5185  df-xp 5283  df-rel 5284  df-cnv 5285  df-co 5286  df-dm 5287  df-iota 6031  df-fun 6070  df-fv 6076  df-proset 17196  df-poset 17214  df-plt 17226
This theorem is referenced by:  pltletr  17239  plelttr  17240  pospo  17241  archiabllem2c  30131  ofldchr  30196  hlhgt2  35277  hl0lt1N  35278  lhp0lt  35891
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