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Mirrors > Home > MPE Home > Th. List > joindm | Structured version Visualization version GIF version |
Description: Domain of join function for a poset-type structure. (Contributed by NM, 16-Sep-2018.) |
Ref | Expression |
---|---|
joinfval.u | ⊢ 𝑈 = (lub‘𝐾) |
joinfval.j | ⊢ ∨ = (join‘𝐾) |
Ref | Expression |
---|---|
joindm | ⊢ (𝐾 ∈ 𝑉 → dom ∨ = {〈𝑥, 𝑦〉 ∣ {𝑥, 𝑦} ∈ dom 𝑈}) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | joinfval.u | . . . 4 ⊢ 𝑈 = (lub‘𝐾) | |
2 | joinfval.j | . . . 4 ⊢ ∨ = (join‘𝐾) | |
3 | 1, 2 | joinfval2 18432 | . . 3 ⊢ (𝐾 ∈ 𝑉 → ∨ = {〈〈𝑥, 𝑦〉, 𝑧〉 ∣ ({𝑥, 𝑦} ∈ dom 𝑈 ∧ 𝑧 = (𝑈‘{𝑥, 𝑦}))}) |
4 | 3 | dmeqd 5919 | . 2 ⊢ (𝐾 ∈ 𝑉 → dom ∨ = dom {〈〈𝑥, 𝑦〉, 𝑧〉 ∣ ({𝑥, 𝑦} ∈ dom 𝑈 ∧ 𝑧 = (𝑈‘{𝑥, 𝑦}))}) |
5 | dmoprab 7535 | . . 3 ⊢ dom {〈〈𝑥, 𝑦〉, 𝑧〉 ∣ ({𝑥, 𝑦} ∈ dom 𝑈 ∧ 𝑧 = (𝑈‘{𝑥, 𝑦}))} = {〈𝑥, 𝑦〉 ∣ ∃𝑧({𝑥, 𝑦} ∈ dom 𝑈 ∧ 𝑧 = (𝑈‘{𝑥, 𝑦}))} | |
6 | fvex 6920 | . . . . . 6 ⊢ (𝑈‘{𝑥, 𝑦}) ∈ V | |
7 | 6 | isseti 3496 | . . . . 5 ⊢ ∃𝑧 𝑧 = (𝑈‘{𝑥, 𝑦}) |
8 | 19.42v 1951 | . . . . 5 ⊢ (∃𝑧({𝑥, 𝑦} ∈ dom 𝑈 ∧ 𝑧 = (𝑈‘{𝑥, 𝑦})) ↔ ({𝑥, 𝑦} ∈ dom 𝑈 ∧ ∃𝑧 𝑧 = (𝑈‘{𝑥, 𝑦}))) | |
9 | 7, 8 | mpbiran2 710 | . . . 4 ⊢ (∃𝑧({𝑥, 𝑦} ∈ dom 𝑈 ∧ 𝑧 = (𝑈‘{𝑥, 𝑦})) ↔ {𝑥, 𝑦} ∈ dom 𝑈) |
10 | 9 | opabbii 5215 | . . 3 ⊢ {〈𝑥, 𝑦〉 ∣ ∃𝑧({𝑥, 𝑦} ∈ dom 𝑈 ∧ 𝑧 = (𝑈‘{𝑥, 𝑦}))} = {〈𝑥, 𝑦〉 ∣ {𝑥, 𝑦} ∈ dom 𝑈} |
11 | 5, 10 | eqtri 2763 | . 2 ⊢ dom {〈〈𝑥, 𝑦〉, 𝑧〉 ∣ ({𝑥, 𝑦} ∈ dom 𝑈 ∧ 𝑧 = (𝑈‘{𝑥, 𝑦}))} = {〈𝑥, 𝑦〉 ∣ {𝑥, 𝑦} ∈ dom 𝑈} |
12 | 4, 11 | eqtrdi 2791 | 1 ⊢ (𝐾 ∈ 𝑉 → dom ∨ = {〈𝑥, 𝑦〉 ∣ {𝑥, 𝑦} ∈ dom 𝑈}) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 395 = wceq 1537 ∃wex 1776 ∈ wcel 2106 {cpr 4633 {copab 5210 dom cdm 5689 ‘cfv 6563 {coprab 7432 lubclub 18367 joincjn 18369 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-rep 5285 ax-sep 5302 ax-nul 5312 ax-pow 5371 ax-pr 5438 ax-un 7754 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-ral 3060 df-rex 3069 df-rmo 3378 df-reu 3379 df-rab 3434 df-v 3480 df-sbc 3792 df-csb 3909 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-nul 4340 df-if 4532 df-pw 4607 df-sn 4632 df-pr 4634 df-op 4638 df-uni 4913 df-iun 4998 df-br 5149 df-opab 5211 df-mpt 5232 df-id 5583 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-res 5701 df-ima 5702 df-iota 6516 df-fun 6565 df-fn 6566 df-f 6567 df-f1 6568 df-fo 6569 df-f1o 6570 df-fv 6571 df-riota 7388 df-oprab 7435 df-lub 18404 df-join 18406 |
This theorem is referenced by: joindef 18434 joindmss 18437 |
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