Theorem clatglbcl2 17475

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 ∧ 𝑆 ⊆ 𝐵) → 𝑆 ∈ dom 𝐺)

Proof of Theorem clatglbcl2

Step	Hyp	Ref	Expression
1		clatglbcl.b	. . . . . 6 ⊢ 𝐵 = (Base‘𝐾)
2	1	fvexi 6451	. . . . 5 ⊢ 𝐵 ∈ V
3	2	elpw2 5052	. . . 4 ⊢ (𝑆 ∈ 𝒫 𝐵 ↔ 𝑆 ⊆ 𝐵)
4	3	biimpri 220	. . 3 ⊢ (𝑆 ⊆ 𝐵 → 𝑆 ∈ 𝒫 𝐵)
5	4	adantl 475	. 2 ⊢ ((𝐾 ∈ CLat ∧ 𝑆 ⊆ 𝐵) → 𝑆 ∈ 𝒫 𝐵)
6		eqid 2825	. . . . 5 ⊢ (lub‘𝐾) = (lub‘𝐾)
7		clatglbcl.g	. . . . 5 ⊢ 𝐺 = (glb‘𝐾)
8	1, 6, 7	isclat 17469	. . . 4 ⊢ (𝐾 ∈ CLat ↔ (𝐾 ∈ Poset ∧ (dom (lub‘𝐾) = 𝒫 𝐵 ∧ dom 𝐺 = 𝒫 𝐵)))
9		simprr 789	. . . 4 ⊢ ((𝐾 ∈ Poset ∧ (dom (lub‘𝐾) = 𝒫 𝐵 ∧ dom 𝐺 = 𝒫 𝐵)) → dom 𝐺 = 𝒫 𝐵)
10	8, 9	sylbi 209	. . 3 ⊢ (𝐾 ∈ CLat → dom 𝐺 = 𝒫 𝐵)
11	10	adantr 474	. 2 ⊢ ((𝐾 ∈ CLat ∧ 𝑆 ⊆ 𝐵) → dom 𝐺 = 𝒫 𝐵)
12	5, 11	eleqtrrd 2909	1 ⊢ ((𝐾 ∈ CLat ∧ 𝑆 ⊆ 𝐵) → 𝑆 ∈ dom 𝐺)

Syntax hints:   → wi 4   ∧ wa 386   = wceq 1656   ∈ wcel 2164   ⊆ wss 3798  𝒫 cpw 4380  dom cdm 5346  ‘cfv 6127  Basecbs 16229  Posetcpo 17300  lubclub 17302  glbcglb 17303  CLatccla 17467

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1894  ax-4 1908  ax-5 2009  ax-6 2075  ax-7 2112  ax-9 2173  ax-10 2192  ax-11 2207  ax-12 2220  ax-13 2389  ax-ext 2803  ax-sep 5007  ax-nul 5015

This theorem depends on definitions:  df-bi 199  df-an 387  df-or 879  df-3an 1113  df-tru 1660  df-ex 1879  df-nf 1883  df-sb 2068  df-mo 2605  df-eu 2640  df-clab 2812  df-cleq 2818  df-clel 2821  df-nfc 2958  df-ral 3122  df-rex 3123  df-rab 3126  df-v 3416  df-sbc 3663  df-dif 3801  df-un 3803  df-in 3805  df-ss 3812  df-nul 4147  df-if 4309  df-pw 4382  df-sn 4400  df-pr 4402  df-op 4406  df-uni 4661  df-br 4876  df-dm 5356  df-iota 6090  df-fv 6135  df-clat 17468

This theorem is referenced by:  isglbd  17477  clatglb  17484  clatglble  17485