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Mirrors > Home > MPE Home > Th. List > mreintcl | Structured version Visualization version GIF version |
Description: A nonempty collection of closed sets has a closed intersection. (Contributed by Stefan O'Rear, 30-Jan-2015.) |
Ref | Expression |
---|---|
mreintcl | ⊢ ((𝐶 ∈ (Moore‘𝑋) ∧ 𝑆 ⊆ 𝐶 ∧ 𝑆 ≠ ∅) → ∩ 𝑆 ∈ 𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elpw2g 5214 | . . . 4 ⊢ (𝐶 ∈ (Moore‘𝑋) → (𝑆 ∈ 𝒫 𝐶 ↔ 𝑆 ⊆ 𝐶)) | |
2 | 1 | biimpar 481 | . . 3 ⊢ ((𝐶 ∈ (Moore‘𝑋) ∧ 𝑆 ⊆ 𝐶) → 𝑆 ∈ 𝒫 𝐶) |
3 | 2 | 3adant3 1129 | . 2 ⊢ ((𝐶 ∈ (Moore‘𝑋) ∧ 𝑆 ⊆ 𝐶 ∧ 𝑆 ≠ ∅) → 𝑆 ∈ 𝒫 𝐶) |
4 | ismre 16919 | . . . 4 ⊢ (𝐶 ∈ (Moore‘𝑋) ↔ (𝐶 ⊆ 𝒫 𝑋 ∧ 𝑋 ∈ 𝐶 ∧ ∀𝑠 ∈ 𝒫 𝐶(𝑠 ≠ ∅ → ∩ 𝑠 ∈ 𝐶))) | |
5 | 4 | simp3bi 1144 | . . 3 ⊢ (𝐶 ∈ (Moore‘𝑋) → ∀𝑠 ∈ 𝒫 𝐶(𝑠 ≠ ∅ → ∩ 𝑠 ∈ 𝐶)) |
6 | 5 | 3ad2ant1 1130 | . 2 ⊢ ((𝐶 ∈ (Moore‘𝑋) ∧ 𝑆 ⊆ 𝐶 ∧ 𝑆 ≠ ∅) → ∀𝑠 ∈ 𝒫 𝐶(𝑠 ≠ ∅ → ∩ 𝑠 ∈ 𝐶)) |
7 | simp3 1135 | . 2 ⊢ ((𝐶 ∈ (Moore‘𝑋) ∧ 𝑆 ⊆ 𝐶 ∧ 𝑆 ≠ ∅) → 𝑆 ≠ ∅) | |
8 | neeq1 3013 | . . . . 5 ⊢ (𝑠 = 𝑆 → (𝑠 ≠ ∅ ↔ 𝑆 ≠ ∅)) | |
9 | inteq 4841 | . . . . . 6 ⊢ (𝑠 = 𝑆 → ∩ 𝑠 = ∩ 𝑆) | |
10 | 9 | eleq1d 2836 | . . . . 5 ⊢ (𝑠 = 𝑆 → (∩ 𝑠 ∈ 𝐶 ↔ ∩ 𝑆 ∈ 𝐶)) |
11 | 8, 10 | imbi12d 348 | . . . 4 ⊢ (𝑠 = 𝑆 → ((𝑠 ≠ ∅ → ∩ 𝑠 ∈ 𝐶) ↔ (𝑆 ≠ ∅ → ∩ 𝑆 ∈ 𝐶))) |
12 | 11 | rspcva 3539 | . . 3 ⊢ ((𝑆 ∈ 𝒫 𝐶 ∧ ∀𝑠 ∈ 𝒫 𝐶(𝑠 ≠ ∅ → ∩ 𝑠 ∈ 𝐶)) → (𝑆 ≠ ∅ → ∩ 𝑆 ∈ 𝐶)) |
13 | 12 | 3impia 1114 | . 2 ⊢ ((𝑆 ∈ 𝒫 𝐶 ∧ ∀𝑠 ∈ 𝒫 𝐶(𝑠 ≠ ∅ → ∩ 𝑠 ∈ 𝐶) ∧ 𝑆 ≠ ∅) → ∩ 𝑆 ∈ 𝐶) |
14 | 3, 6, 7, 13 | syl3anc 1368 | 1 ⊢ ((𝐶 ∈ (Moore‘𝑋) ∧ 𝑆 ⊆ 𝐶 ∧ 𝑆 ≠ ∅) → ∩ 𝑆 ∈ 𝐶) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ w3a 1084 = wceq 1538 ∈ wcel 2111 ≠ wne 2951 ∀wral 3070 ⊆ wss 3858 ∅c0 4225 𝒫 cpw 4494 ∩ cint 4838 ‘cfv 6335 Moorecmre 16911 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2729 ax-sep 5169 ax-nul 5176 ax-pow 5234 ax-pr 5298 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3an 1086 df-tru 1541 df-fal 1551 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2557 df-eu 2588 df-clab 2736 df-cleq 2750 df-clel 2830 df-nfc 2901 df-ne 2952 df-ral 3075 df-rex 3076 df-rab 3079 df-v 3411 df-sbc 3697 df-dif 3861 df-un 3863 df-in 3865 df-ss 3875 df-nul 4226 df-if 4421 df-pw 4496 df-sn 4523 df-pr 4525 df-op 4529 df-uni 4799 df-int 4839 df-br 5033 df-opab 5095 df-mpt 5113 df-id 5430 df-xp 5530 df-rel 5531 df-cnv 5532 df-co 5533 df-dm 5534 df-iota 6294 df-fun 6337 df-fv 6343 df-mre 16915 |
This theorem is referenced by: mreiincl 16925 mrerintcl 16926 mreincl 16928 mremre 16933 submre 16934 mrcflem 16935 mrelatglb 17860 mreclatBAD 17863 |
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