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Mirrors > Home > MPE Home > Th. List > Mathboxes > lubprdm | Structured version Visualization version GIF version |
Description: The set of two comparable elements in a poset has LUB. (Contributed by Zhi Wang, 26-Sep-2024.) |
Ref | Expression |
---|---|
lubpr.k | ⊢ (𝜑 → 𝐾 ∈ Poset) |
lubpr.b | ⊢ 𝐵 = (Base‘𝐾) |
lubpr.x | ⊢ (𝜑 → 𝑋 ∈ 𝐵) |
lubpr.y | ⊢ (𝜑 → 𝑌 ∈ 𝐵) |
lubpr.l | ⊢ ≤ = (le‘𝐾) |
lubpr.c | ⊢ (𝜑 → 𝑋 ≤ 𝑌) |
lubpr.s | ⊢ (𝜑 → 𝑆 = {𝑋, 𝑌}) |
lubpr.u | ⊢ 𝑈 = (lub‘𝐾) |
Ref | Expression |
---|---|
lubprdm | ⊢ (𝜑 → 𝑆 ∈ dom 𝑈) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | lubpr.k | . . 3 ⊢ (𝜑 → 𝐾 ∈ Poset) | |
2 | lubpr.b | . . 3 ⊢ 𝐵 = (Base‘𝐾) | |
3 | lubpr.x | . . 3 ⊢ (𝜑 → 𝑋 ∈ 𝐵) | |
4 | lubpr.y | . . 3 ⊢ (𝜑 → 𝑌 ∈ 𝐵) | |
5 | lubpr.l | . . 3 ⊢ ≤ = (le‘𝐾) | |
6 | lubpr.c | . . 3 ⊢ (𝜑 → 𝑋 ≤ 𝑌) | |
7 | lubpr.s | . . 3 ⊢ (𝜑 → 𝑆 = {𝑋, 𝑌}) | |
8 | lubpr.u | . . 3 ⊢ 𝑈 = (lub‘𝐾) | |
9 | 1, 2, 3, 4, 5, 6, 7, 8 | lubprlem 45872 | . 2 ⊢ (𝜑 → (𝑆 ∈ dom 𝑈 ∧ (𝑈‘𝑆) = 𝑌)) |
10 | 9 | simpld 498 | 1 ⊢ (𝜑 → 𝑆 ∈ dom 𝑈) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1543 ∈ wcel 2112 {cpr 4529 class class class wbr 5039 dom cdm 5536 ‘cfv 6358 Basecbs 16666 lecple 16756 Posetcpo 17768 lubclub 17770 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2018 ax-8 2114 ax-9 2122 ax-10 2143 ax-11 2160 ax-12 2177 ax-ext 2708 ax-rep 5164 ax-sep 5177 ax-nul 5184 ax-pow 5243 ax-pr 5307 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2073 df-mo 2539 df-eu 2568 df-clab 2715 df-cleq 2728 df-clel 2809 df-nfc 2879 df-ne 2933 df-ral 3056 df-rex 3057 df-reu 3058 df-rmo 3059 df-rab 3060 df-v 3400 df-sbc 3684 df-csb 3799 df-dif 3856 df-un 3858 df-in 3860 df-ss 3870 df-nul 4224 df-if 4426 df-pw 4501 df-sn 4528 df-pr 4530 df-op 4534 df-uni 4806 df-iun 4892 df-br 5040 df-opab 5102 df-mpt 5121 df-id 5440 df-xp 5542 df-rel 5543 df-cnv 5544 df-co 5545 df-dm 5546 df-rn 5547 df-res 5548 df-ima 5549 df-iota 6316 df-fun 6360 df-fn 6361 df-f 6362 df-f1 6363 df-fo 6364 df-f1o 6365 df-fv 6366 df-riota 7148 df-proset 17756 df-poset 17774 df-lub 17806 |
This theorem is referenced by: glbprlem 45875 toslat 45884 |
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