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Theorem clatglbcl2 17115
Description: Any subset of the base set has a GLB in a complete lattice. (Contributed by NM, 13-Sep-2018.)
Hypotheses
Ref Expression
clatglbcl.b 𝐵 = (Base‘𝐾)
clatglbcl.g 𝐺 = (glb‘𝐾)
Assertion
Ref Expression
clatglbcl2 ((𝐾 ∈ CLat ∧ 𝑆𝐵) → 𝑆 ∈ dom 𝐺)

Proof of Theorem clatglbcl2
StepHypRef Expression
1 clatglbcl.b . . . . . 6 𝐵 = (Base‘𝐾)
2 fvex 6201 . . . . . 6 (Base‘𝐾) ∈ V
31, 2eqeltri 2697 . . . . 5 𝐵 ∈ V
43elpw2 4828 . . . 4 (𝑆 ∈ 𝒫 𝐵𝑆𝐵)
54biimpri 218 . . 3 (𝑆𝐵𝑆 ∈ 𝒫 𝐵)
65adantl 482 . 2 ((𝐾 ∈ CLat ∧ 𝑆𝐵) → 𝑆 ∈ 𝒫 𝐵)
7 eqid 2622 . . . . 5 (lub‘𝐾) = (lub‘𝐾)
8 clatglbcl.g . . . . 5 𝐺 = (glb‘𝐾)
91, 7, 8isclat 17109 . . . 4 (𝐾 ∈ CLat ↔ (𝐾 ∈ Poset ∧ (dom (lub‘𝐾) = 𝒫 𝐵 ∧ dom 𝐺 = 𝒫 𝐵)))
10 simprr 796 . . . 4 ((𝐾 ∈ Poset ∧ (dom (lub‘𝐾) = 𝒫 𝐵 ∧ dom 𝐺 = 𝒫 𝐵)) → dom 𝐺 = 𝒫 𝐵)
119, 10sylbi 207 . . 3 (𝐾 ∈ CLat → dom 𝐺 = 𝒫 𝐵)
1211adantr 481 . 2 ((𝐾 ∈ CLat ∧ 𝑆𝐵) → dom 𝐺 = 𝒫 𝐵)
136, 12eleqtrrd 2704 1 ((𝐾 ∈ CLat ∧ 𝑆𝐵) → 𝑆 ∈ dom 𝐺)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 384   = wceq 1483  wcel 1990  Vcvv 3200  wss 3574  𝒫 cpw 4158  dom cdm 5114  cfv 5888  Basecbs 15857  Posetcpo 16940  lubclub 16942  glbcglb 16943  CLatccla 17107
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-sbc 3436  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-br 4654  df-dm 5124  df-iota 5851  df-fv 5896  df-clat 17108
This theorem is referenced by:  isglbd  17117  clatglb  17124  clatglble  17125
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