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| Mirrors > Home > MPE Home > Th. List > Mathboxes > posjidm | Structured version Visualization version GIF version | ||
| Description: Poset join is idempotent. latjidm 18507 could be shortened by this. (Contributed by Zhi Wang, 27-Sep-2024.) |
| Ref | Expression |
|---|---|
| posjidm.b | ⊢ 𝐵 = (Base‘𝐾) |
| posjidm.j | ⊢ ∨ = (join‘𝐾) |
| Ref | Expression |
|---|---|
| posjidm | ⊢ ((𝐾 ∈ Poset ∧ 𝑋 ∈ 𝐵) → (𝑋 ∨ 𝑋) = 𝑋) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2737 | . . 3 ⊢ (lub‘𝐾) = (lub‘𝐾) | |
| 2 | posjidm.j | . . 3 ⊢ ∨ = (join‘𝐾) | |
| 3 | simpl 482 | . . 3 ⊢ ((𝐾 ∈ Poset ∧ 𝑋 ∈ 𝐵) → 𝐾 ∈ Poset) | |
| 4 | simpr 484 | . . 3 ⊢ ((𝐾 ∈ Poset ∧ 𝑋 ∈ 𝐵) → 𝑋 ∈ 𝐵) | |
| 5 | 1, 2, 3, 4, 4 | joinval 18422 | . 2 ⊢ ((𝐾 ∈ Poset ∧ 𝑋 ∈ 𝐵) → (𝑋 ∨ 𝑋) = ((lub‘𝐾)‘{𝑋, 𝑋})) |
| 6 | posjidm.b | . . 3 ⊢ 𝐵 = (Base‘𝐾) | |
| 7 | eqid 2737 | . . 3 ⊢ (le‘𝐾) = (le‘𝐾) | |
| 8 | 6, 7 | posref 18364 | . . 3 ⊢ ((𝐾 ∈ Poset ∧ 𝑋 ∈ 𝐵) → 𝑋(le‘𝐾)𝑋) |
| 9 | eqidd 2738 | . . 3 ⊢ ((𝐾 ∈ Poset ∧ 𝑋 ∈ 𝐵) → {𝑋, 𝑋} = {𝑋, 𝑋}) | |
| 10 | 3, 6, 4, 4, 7, 8, 9, 1 | lubpr 48861 | . 2 ⊢ ((𝐾 ∈ Poset ∧ 𝑋 ∈ 𝐵) → ((lub‘𝐾)‘{𝑋, 𝑋}) = 𝑋) |
| 11 | 5, 10 | eqtrd 2777 | 1 ⊢ ((𝐾 ∈ Poset ∧ 𝑋 ∈ 𝐵) → (𝑋 ∨ 𝑋) = 𝑋) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1540 ∈ wcel 2108 {cpr 4628 ‘cfv 6561 (class class class)co 7431 Basecbs 17247 lecple 17304 Posetcpo 18353 lubclub 18355 joincjn 18357 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2708 ax-rep 5279 ax-sep 5296 ax-nul 5306 ax-pow 5365 ax-pr 5432 ax-un 7755 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2540 df-eu 2569 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2892 df-ne 2941 df-ral 3062 df-rex 3071 df-rmo 3380 df-reu 3381 df-rab 3437 df-v 3482 df-sbc 3789 df-csb 3900 df-dif 3954 df-un 3956 df-in 3958 df-ss 3968 df-nul 4334 df-if 4526 df-pw 4602 df-sn 4627 df-pr 4629 df-op 4633 df-uni 4908 df-iun 4993 df-br 5144 df-opab 5206 df-mpt 5226 df-id 5578 df-xp 5691 df-rel 5692 df-cnv 5693 df-co 5694 df-dm 5695 df-rn 5696 df-res 5697 df-ima 5698 df-iota 6514 df-fun 6563 df-fn 6564 df-f 6565 df-f1 6566 df-fo 6567 df-f1o 6568 df-fv 6569 df-riota 7388 df-ov 7434 df-oprab 7435 df-proset 18340 df-poset 18359 df-lub 18391 df-join 18393 |
| This theorem is referenced by: (None) |
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