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Mirrors > Home > MPE Home > Th. List > clatlubcl2 | Structured version Visualization version GIF version |
Description: Any subset of the base set has an LUB in a complete lattice. (Contributed by NM, 13-Sep-2018.) |
Ref | Expression |
---|---|
clatlubcl.b | ⊢ 𝐵 = (Base‘𝐾) |
clatlubcl.u | ⊢ 𝑈 = (lub‘𝐾) |
Ref | Expression |
---|---|
clatlubcl2 | ⊢ ((𝐾 ∈ CLat ∧ 𝑆 ⊆ 𝐵) → 𝑆 ∈ dom 𝑈) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | clatlubcl.b | . . . . . 6 ⊢ 𝐵 = (Base‘𝐾) | |
2 | 1 | fvexi 6684 | . . . . 5 ⊢ 𝐵 ∈ V |
3 | 2 | elpw2 5248 | . . . 4 ⊢ (𝑆 ∈ 𝒫 𝐵 ↔ 𝑆 ⊆ 𝐵) |
4 | 3 | biimpri 230 | . . 3 ⊢ (𝑆 ⊆ 𝐵 → 𝑆 ∈ 𝒫 𝐵) |
5 | 4 | adantl 484 | . 2 ⊢ ((𝐾 ∈ CLat ∧ 𝑆 ⊆ 𝐵) → 𝑆 ∈ 𝒫 𝐵) |
6 | clatlubcl.u | . . . . 5 ⊢ 𝑈 = (lub‘𝐾) | |
7 | eqid 2821 | . . . . 5 ⊢ (glb‘𝐾) = (glb‘𝐾) | |
8 | 1, 6, 7 | isclat 17719 | . . . 4 ⊢ (𝐾 ∈ CLat ↔ (𝐾 ∈ Poset ∧ (dom 𝑈 = 𝒫 𝐵 ∧ dom (glb‘𝐾) = 𝒫 𝐵))) |
9 | simprl 769 | . . . 4 ⊢ ((𝐾 ∈ Poset ∧ (dom 𝑈 = 𝒫 𝐵 ∧ dom (glb‘𝐾) = 𝒫 𝐵)) → dom 𝑈 = 𝒫 𝐵) | |
10 | 8, 9 | sylbi 219 | . . 3 ⊢ (𝐾 ∈ CLat → dom 𝑈 = 𝒫 𝐵) |
11 | 10 | adantr 483 | . 2 ⊢ ((𝐾 ∈ CLat ∧ 𝑆 ⊆ 𝐵) → dom 𝑈 = 𝒫 𝐵) |
12 | 5, 11 | eleqtrrd 2916 | 1 ⊢ ((𝐾 ∈ CLat ∧ 𝑆 ⊆ 𝐵) → 𝑆 ∈ dom 𝑈) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 = wceq 1537 ∈ wcel 2114 ⊆ wss 3936 𝒫 cpw 4539 dom cdm 5555 ‘cfv 6355 Basecbs 16483 Posetcpo 17550 lubclub 17552 glbcglb 17553 CLatccla 17717 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5203 ax-nul 5210 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3496 df-sbc 3773 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4839 df-br 5067 df-dm 5565 df-iota 6314 df-fv 6363 df-clat 17718 |
This theorem is referenced by: lublem 17728 |
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