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Theorem plttr 17191
Description: The less-than relation is transitive. (psstr 3853 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 2760 . . . . . 6 (le‘𝐾) = (le‘𝐾)
2 pltnlt.s . . . . . 6 < = (lt‘𝐾)
31, 2pltle 17182 . . . . 5 ((𝐾 ∈ Poset ∧ 𝑋𝐵𝑌𝐵) → (𝑋 < 𝑌𝑋(le‘𝐾)𝑌))
433adant3r3 1200 . . . 4 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 < 𝑌𝑋(le‘𝐾)𝑌))
51, 2pltle 17182 . . . . 5 ((𝐾 ∈ Poset ∧ 𝑌𝐵𝑍𝐵) → (𝑌 < 𝑍𝑌(le‘𝐾)𝑍))
653adant3r1 1198 . . . 4 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑌 < 𝑍𝑌(le‘𝐾)𝑍))
7 pltnlt.b . . . . 5 𝐵 = (Base‘𝐾)
87, 1postr 17174 . . . 4 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋(le‘𝐾)𝑌𝑌(le‘𝐾)𝑍) → 𝑋(le‘𝐾)𝑍))
94, 6, 8syl2and 501 . . 3 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 < 𝑌𝑌 < 𝑍) → 𝑋(le‘𝐾)𝑍))
107, 2pltn2lp 17190 . . . . . 6 ((𝐾 ∈ Poset ∧ 𝑋𝐵𝑌𝐵) → ¬ (𝑋 < 𝑌𝑌 < 𝑋))
11103adant3r3 1200 . . . . 5 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ¬ (𝑋 < 𝑌𝑌 < 𝑋))
12 breq2 4808 . . . . . . 7 (𝑋 = 𝑍 → (𝑌 < 𝑋𝑌 < 𝑍))
1312anbi2d 742 . . . . . 6 (𝑋 = 𝑍 → ((𝑋 < 𝑌𝑌 < 𝑋) ↔ (𝑋 < 𝑌𝑌 < 𝑍)))
1413notbid 307 . . . . 5 (𝑋 = 𝑍 → (¬ (𝑋 < 𝑌𝑌 < 𝑋) ↔ ¬ (𝑋 < 𝑌𝑌 < 𝑍)))
1511, 14syl5ibcom 235 . . . 4 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 = 𝑍 → ¬ (𝑋 < 𝑌𝑌 < 𝑍)))
1615necon2ad 2947 . . 3 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 < 𝑌𝑌 < 𝑍) → 𝑋𝑍))
179, 16jcad 556 . 2 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 < 𝑌𝑌 < 𝑍) → (𝑋(le‘𝐾)𝑍𝑋𝑍)))
181, 2pltval 17181 . . 3 ((𝐾 ∈ Poset ∧ 𝑋𝐵𝑍𝐵) → (𝑋 < 𝑍 ↔ (𝑋(le‘𝐾)𝑍𝑋𝑍)))
19183adant3r2 1199 . 2 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 < 𝑍 ↔ (𝑋(le‘𝐾)𝑍𝑋𝑍)))
2017, 19sylibrd 249 1 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 < 𝑌𝑌 < 𝑍) → 𝑋 < 𝑍))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 196  wa 383  w3a 1072   = wceq 1632  wcel 2139  wne 2932   class class class wbr 4804  cfv 6049  Basecbs 16079  lecple 16170  Posetcpo 17161  ltcplt 17162
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1871  ax-4 1886  ax-5 1988  ax-6 2054  ax-7 2090  ax-9 2148  ax-10 2168  ax-11 2183  ax-12 2196  ax-13 2391  ax-ext 2740  ax-sep 4933  ax-nul 4941  ax-pr 5055
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1074  df-tru 1635  df-ex 1854  df-nf 1859  df-sb 2047  df-eu 2611  df-mo 2612  df-clab 2747  df-cleq 2753  df-clel 2756  df-nfc 2891  df-ne 2933  df-ral 3055  df-rex 3056  df-rab 3059  df-v 3342  df-sbc 3577  df-dif 3718  df-un 3720  df-in 3722  df-ss 3729  df-nul 4059  df-if 4231  df-sn 4322  df-pr 4324  df-op 4328  df-uni 4589  df-br 4805  df-opab 4865  df-mpt 4882  df-id 5174  df-xp 5272  df-rel 5273  df-cnv 5274  df-co 5275  df-dm 5276  df-iota 6012  df-fun 6051  df-fv 6057  df-preset 17149  df-poset 17167  df-plt 17179
This theorem is referenced by:  pltletr  17192  plelttr  17193  pospo  17194  archiabllem2c  30079  ofldchr  30144  hlhgt2  35196  hl0lt1N  35197  lhp0lt  35810
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