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Theorem plelttr 18415
Description: Transitive law for chained "less than or equal to" and "less than". (sspsstr 4064 analog.) (Contributed by NM, 2-May-2012.)
Hypotheses
Ref Expression
pltletr.b 𝐵 = (Base‘𝐾)
pltletr.l = (le‘𝐾)
pltletr.s < = (lt‘𝐾)
Assertion
Ref Expression
plelttr ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 𝑌𝑌 < 𝑍) → 𝑋 < 𝑍))

Proof of Theorem plelttr
StepHypRef Expression
1 pltletr.b . . . . 5 𝐵 = (Base‘𝐾)
2 pltletr.l . . . . 5 = (le‘𝐾)
3 pltletr.s . . . . 5 < = (lt‘𝐾)
41, 2, 3pleval2 18408 . . . 4 ((𝐾 ∈ Poset ∧ 𝑋𝐵𝑌𝐵) → (𝑋 𝑌 ↔ (𝑋 < 𝑌𝑋 = 𝑌)))
543adant3r3 1203 . . 3 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 𝑌 ↔ (𝑋 < 𝑌𝑋 = 𝑌)))
61, 3plttr 18413 . . . . 5 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 < 𝑌𝑌 < 𝑍) → 𝑋 < 𝑍))
76expd 421 . . . 4 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 < 𝑌 → (𝑌 < 𝑍𝑋 < 𝑍)))
8 breq1 5114 . . . . . 6 (𝑋 = 𝑌 → (𝑋 < 𝑍𝑌 < 𝑍))
98biimprd 251 . . . . 5 (𝑋 = 𝑌 → (𝑌 < 𝑍𝑋 < 𝑍))
109a1i 11 . . . 4 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 = 𝑌 → (𝑌 < 𝑍𝑋 < 𝑍)))
117, 10jaod 873 . . 3 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 < 𝑌𝑋 = 𝑌) → (𝑌 < 𝑍𝑋 < 𝑍)))
125, 11sylbid 243 . 2 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 𝑌 → (𝑌 < 𝑍𝑋 < 𝑍)))
1312impd 416 1 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 𝑌𝑌 < 𝑍) → 𝑋 < 𝑍))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  wb 209  wa 401  wo 861  w3a 1103   = wceq 1570  wcel 2146   class class class wbr 5111  cfv 6540  Basecbs 17286  lecple 17334  Posetcpo 18380  ltcplt 18381
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2195  ax-12 2216  ax-ext 2737  ax-sep 5259  ax-nul 5271  ax-pr 5406
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2569  df-eu 2599  df-clab 2744  df-cleq 2757  df-clel 2840  df-nfc 2914  df-ne 2961  df-ral 3082  df-rex 3092  df-rab 3419  df-v 3459  df-sbc 3747  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4287  df-if 4490  df-sn 4592  df-pr 4594  df-op 4598  df-uni 4875  df-br 5112  df-opab 5176  df-mpt 5195  df-id 5558  df-xp 5669  df-rel 5670  df-cnv 5671  df-co 5672  df-dm 5673  df-iota 6496  df-fun 6542  df-fv 6548  df-proset 18367  df-poset 18386  df-plt 18401
This theorem is used by:  isarchi3  33530  archiabllem2c  33538  athgt  40263  1cvratex  40280
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