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Mirrors > Home > MPE Home > Th. List > meetdef | Structured version Visualization version GIF version |
Description: Two ways to say that a meet is defined. (Contributed by NM, 9-Sep-2018.) |
Ref | Expression |
---|---|
meetdef.u | ⊢ 𝐺 = (glb‘𝐾) |
meetdef.m | ⊢ ∧ = (meet‘𝐾) |
meetdef.k | ⊢ (𝜑 → 𝐾 ∈ 𝑉) |
meetdef.x | ⊢ (𝜑 → 𝑋 ∈ 𝑊) |
meetdef.y | ⊢ (𝜑 → 𝑌 ∈ 𝑍) |
Ref | Expression |
---|---|
meetdef | ⊢ (𝜑 → (〈𝑋, 𝑌〉 ∈ dom ∧ ↔ {𝑋, 𝑌} ∈ dom 𝐺)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | meetdef.k | . . 3 ⊢ (𝜑 → 𝐾 ∈ 𝑉) | |
2 | meetdef.u | . . . . 5 ⊢ 𝐺 = (glb‘𝐾) | |
3 | meetdef.m | . . . . 5 ⊢ ∧ = (meet‘𝐾) | |
4 | 2, 3 | meetdm 17627 | . . . 4 ⊢ (𝐾 ∈ 𝑉 → dom ∧ = {〈𝑥, 𝑦〉 ∣ {𝑥, 𝑦} ∈ dom 𝐺}) |
5 | 4 | eleq2d 2898 | . . 3 ⊢ (𝐾 ∈ 𝑉 → (〈𝑋, 𝑌〉 ∈ dom ∧ ↔ 〈𝑋, 𝑌〉 ∈ {〈𝑥, 𝑦〉 ∣ {𝑥, 𝑦} ∈ dom 𝐺})) |
6 | 1, 5 | syl 17 | . 2 ⊢ (𝜑 → (〈𝑋, 𝑌〉 ∈ dom ∧ ↔ 〈𝑋, 𝑌〉 ∈ {〈𝑥, 𝑦〉 ∣ {𝑥, 𝑦} ∈ dom 𝐺})) |
7 | meetdef.x | . . 3 ⊢ (𝜑 → 𝑋 ∈ 𝑊) | |
8 | meetdef.y | . . 3 ⊢ (𝜑 → 𝑌 ∈ 𝑍) | |
9 | preq1 4669 | . . . . 5 ⊢ (𝑥 = 𝑋 → {𝑥, 𝑦} = {𝑋, 𝑦}) | |
10 | 9 | eleq1d 2897 | . . . 4 ⊢ (𝑥 = 𝑋 → ({𝑥, 𝑦} ∈ dom 𝐺 ↔ {𝑋, 𝑦} ∈ dom 𝐺)) |
11 | preq2 4670 | . . . . 5 ⊢ (𝑦 = 𝑌 → {𝑋, 𝑦} = {𝑋, 𝑌}) | |
12 | 11 | eleq1d 2897 | . . . 4 ⊢ (𝑦 = 𝑌 → ({𝑋, 𝑦} ∈ dom 𝐺 ↔ {𝑋, 𝑌} ∈ dom 𝐺)) |
13 | 10, 12 | opelopabg 5425 | . . 3 ⊢ ((𝑋 ∈ 𝑊 ∧ 𝑌 ∈ 𝑍) → (〈𝑋, 𝑌〉 ∈ {〈𝑥, 𝑦〉 ∣ {𝑥, 𝑦} ∈ dom 𝐺} ↔ {𝑋, 𝑌} ∈ dom 𝐺)) |
14 | 7, 8, 13 | syl2anc 586 | . 2 ⊢ (𝜑 → (〈𝑋, 𝑌〉 ∈ {〈𝑥, 𝑦〉 ∣ {𝑥, 𝑦} ∈ dom 𝐺} ↔ {𝑋, 𝑌} ∈ dom 𝐺)) |
15 | 6, 14 | bitrd 281 | 1 ⊢ (𝜑 → (〈𝑋, 𝑌〉 ∈ dom ∧ ↔ {𝑋, 𝑌} ∈ dom 𝐺)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 = wceq 1537 ∈ wcel 2114 {cpr 4569 〈cop 4573 {copab 5128 dom cdm 5555 ‘cfv 6355 glbcglb 17553 meetcmee 17555 |
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-rep 5190 ax-sep 5203 ax-nul 5210 ax-pow 5266 ax-pr 5330 ax-un 7461 |
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-ne 3017 df-ral 3143 df-rex 3144 df-reu 3145 df-rab 3147 df-v 3496 df-sbc 3773 df-csb 3884 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-iun 4921 df-br 5067 df-opab 5129 df-mpt 5147 df-id 5460 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-iota 6314 df-fun 6357 df-fn 6358 df-f 6359 df-f1 6360 df-fo 6361 df-f1o 6362 df-fv 6363 df-riota 7114 df-oprab 7160 df-glb 17585 df-meet 17587 |
This theorem is referenced by: meetval 17629 meetcl 17630 meetdmss 17631 meeteu 17634 clatl 17726 |
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