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Theorem tosglb 33415
Description: Same theorem as toslub 33413, for infinimum. (Contributed by Thierry Arnoux, 17-Feb-2018.) (Revised by AV, 28-Sep-2020.)
Hypotheses
Ref Expression
tosglb.b 𝐵 = (Base‘𝐾)
tosglb.l < = (lt‘𝐾)
tosglb.1 (𝜑𝐾 ∈ Toset)
tosglb.2 (𝜑𝐴𝐵)
Assertion
Ref Expression
tosglb (𝜑 → ((glb‘𝐾)‘𝐴) = inf(𝐴, 𝐵, < ))

Proof of Theorem tosglb
Dummy variables 𝑎 𝑏 𝑐 𝑑 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 tosglb.b . . . . 5 𝐵 = (Base‘𝐾)
2 tosglb.l . . . . 5 < = (lt‘𝐾)
3 tosglb.1 . . . . 5 (𝜑𝐾 ∈ Toset)
4 tosglb.2 . . . . 5 (𝜑𝐴𝐵)
5 eqid 2760 . . . . 5 (le‘𝐾) = (le‘𝐾)
61, 2, 3, 4, 5tosglblem 33414 . . . 4 ((𝜑𝑎𝐵) → ((∀𝑏𝐴 𝑎(le‘𝐾)𝑏 ∧ ∀𝑐𝐵 (∀𝑏𝐴 𝑐(le‘𝐾)𝑏𝑐(le‘𝐾)𝑎)) ↔ (∀𝑏𝐴 ¬ 𝑎 < 𝑏 ∧ ∀𝑏𝐵 (𝑏 < 𝑎 → ∃𝑑𝐴 𝑏 < 𝑑))))
76riotabidva 7389 . . 3 (𝜑 → (𝑎𝐵 (∀𝑏𝐴 𝑎(le‘𝐾)𝑏 ∧ ∀𝑐𝐵 (∀𝑏𝐴 𝑐(le‘𝐾)𝑏𝑐(le‘𝐾)𝑎))) = (𝑎𝐵 (∀𝑏𝐴 ¬ 𝑎 < 𝑏 ∧ ∀𝑏𝐵 (𝑏 < 𝑎 → ∃𝑑𝐴 𝑏 < 𝑑))))
8 eqid 2760 . . . 4 (glb‘𝐾) = (glb‘𝐾)
9 biid 264 . . . 4 ((∀𝑏𝐴 𝑎(le‘𝐾)𝑏 ∧ ∀𝑐𝐵 (∀𝑏𝐴 𝑐(le‘𝐾)𝑏𝑐(le‘𝐾)𝑎)) ↔ (∀𝑏𝐴 𝑎(le‘𝐾)𝑏 ∧ ∀𝑐𝐵 (∀𝑏𝐴 𝑐(le‘𝐾)𝑏𝑐(le‘𝐾)𝑎)))
101, 5, 8, 9, 3, 4glbval 18455 . . 3 (𝜑 → ((glb‘𝐾)‘𝐴) = (𝑎𝐵 (∀𝑏𝐴 𝑎(le‘𝐾)𝑏 ∧ ∀𝑐𝐵 (∀𝑏𝐴 𝑐(le‘𝐾)𝑏𝑐(le‘𝐾)𝑎))))
111, 5, 2tosso 18505 . . . . . . 7 (𝐾 ∈ Toset → (𝐾 ∈ Toset ↔ ( < Or 𝐵 ∧ ( I ↾ 𝐵) ⊆ (le‘𝐾))))
1211ibi 270 . . . . . 6 (𝐾 ∈ Toset → ( < Or 𝐵 ∧ ( I ↾ 𝐵) ⊆ (le‘𝐾)))
1312simpld 500 . . . . 5 (𝐾 ∈ Toset → < Or 𝐵)
14 cnvso 6286 . . . . 5 ( < Or 𝐵 < Or 𝐵)
1513, 14sylib 221 . . . 4 (𝐾 ∈ Toset → < Or 𝐵)
16 id 23 . . . . 5 ( < Or 𝐵 < Or 𝐵)
1716supval2 9425 . . . 4 ( < Or 𝐵 → sup(𝐴, 𝐵, < ) = (𝑎𝐵 (∀𝑏𝐴 ¬ 𝑎 < 𝑏 ∧ ∀𝑏𝐵 (𝑏 < 𝑎 → ∃𝑑𝐴 𝑏 < 𝑑))))
183, 15, 173syl 19 . . 3 (𝜑 → sup(𝐴, 𝐵, < ) = (𝑎𝐵 (∀𝑏𝐴 ¬ 𝑎 < 𝑏 ∧ ∀𝑏𝐵 (𝑏 < 𝑎 → ∃𝑑𝐴 𝑏 < 𝑑))))
197, 10, 183eqtr4d 2805 . 2 (𝜑 → ((glb‘𝐾)‘𝐴) = sup(𝐴, 𝐵, < ))
20 df-inf 9413 . . . 4 inf(𝐴, 𝐵, < ) = sup(𝐴, 𝐵, < )
2120eqcomi 2769 . . 3 sup(𝐴, 𝐵, < ) = inf(𝐴, 𝐵, < )
2221a1i 11 . 2 (𝜑 → sup(𝐴, 𝐵, < ) = inf(𝐴, 𝐵, < ))
2319, 22eqtrd 2795 1 (𝜑 → ((glb‘𝐾)‘𝐴) = inf(𝐴, 𝐵, < ))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  ¬ wn 3  wi 4  wa 401   = wceq 1570  wcel 2145  wral 3076  wrex 3086  wss 3899   class class class wbr 5103   I cid 5549   Or wor 5562  ccnv 5654  cres 5657  cfv 6533  crio 7369  supcsup 9410  infcinf 9411  Basecbs 17301  lecple 17349  ltcplt 18396  glbcglb 18398  Tosetctos 18502
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 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2732  ax-rep 5232  ax-sep 5251  ax-nul 5263  ax-pow 5330  ax-pr 5398
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-ral 3077  df-rex 3087  df-rmo 3365  df-reu 3366  df-rab 3413  df-v 3452  df-sbc 3740  df-csb 3848  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-pw 4559  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-iun 4953  df-br 5104  df-opab 5168  df-mpt 5187  df-id 5550  df-po 5563  df-so 5564  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-rn 5666  df-res 5667  df-ima 5668  df-iota 6489  df-fun 6535  df-fn 6536  df-f 6537  df-f1 6538  df-fo 6539  df-f1o 6540  df-fv 6541  df-riota 7370  df-sup 9412  df-inf 9413  df-proset 18382  df-poset 18401  df-plt 18416  df-glb 18433  df-toset 18503
This theorem is used by:  xrsp0  33452
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