MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  cldllycmp Structured version   Visualization version   GIF version
Theorem cldllycmp 22998
Description: A closed subspace of a locally compact space is also locally compact. (The analogous result for open subspaces follows from the more general nllyrest 22989.) (Contributed by Mario Carneiro, 2-Mar-2015.)
Assertion
Ref Expression
cldllycmp ((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) β†’ (𝐽 β†Ύt 𝐴) ∈ 𝑛-Locally Comp)
Proof of Theorem cldllycmp
Dummy variables 𝑒 𝑣 𝑀 π‘₯ 𝑦 𝑠 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 nllytop 22976 . . 3 (𝐽 ∈ 𝑛-Locally Comp β†’ 𝐽 ∈ Top)
2 resttop 22663 . . 3 ((𝐽 ∈ Top ∧ 𝐴 ∈ (Clsdβ€˜π½)) β†’ (𝐽 β†Ύt 𝐴) ∈ Top)
31, 2sylan 580 . 2 ((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) β†’ (𝐽 β†Ύt 𝐴) ∈ Top)
4 elrest 17372 . . . 4 ((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) β†’ (π‘₯ ∈ (𝐽 β†Ύt 𝐴) ↔ βˆƒπ‘’ ∈ 𝐽 π‘₯ = (𝑒 ∩ 𝐴)))
5 simpll 765 . . . . . . . . . 10 (((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) β†’ 𝐽 ∈ 𝑛-Locally Comp)
6 simprl 769 . . . . . . . . . 10 (((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) β†’ 𝑒 ∈ 𝐽)
7 simprr 771 . . . . . . . . . . 11 (((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) β†’ 𝑦 ∈ (𝑒 ∩ 𝐴))
87elin1d 4198 . . . . . . . . . 10 (((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) β†’ 𝑦 ∈ 𝑒)
9 nlly2i 22979 . . . . . . . . . 10 ((𝐽 ∈ 𝑛-Locally Comp ∧ 𝑒 ∈ 𝐽 ∧ 𝑦 ∈ 𝑒) β†’ βˆƒπ‘  ∈ 𝒫 π‘’βˆƒπ‘€ ∈ 𝐽 (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))
105, 6, 8, 9syl3anc 1371 . . . . . . . . 9 (((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) β†’ βˆƒπ‘  ∈ 𝒫 π‘’βˆƒπ‘€ ∈ 𝐽 (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))
113ad2antrr 724 . . . . . . . . . . . . . 14 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ (𝐽 β†Ύt 𝐴) ∈ Top)
121ad3antrrr 728 . . . . . . . . . . . . . . . 16 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ 𝐽 ∈ Top)
13 simpllr 774 . . . . . . . . . . . . . . . 16 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ 𝐴 ∈ (Clsdβ€˜π½))
14 simprlr 778 . . . . . . . . . . . . . . . 16 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ 𝑀 ∈ 𝐽)
15 elrestr 17373 . . . . . . . . . . . . . . . 16 ((𝐽 ∈ Top ∧ 𝐴 ∈ (Clsdβ€˜π½) ∧ 𝑀 ∈ 𝐽) β†’ (𝑀 ∩ 𝐴) ∈ (𝐽 β†Ύt 𝐴))
1612, 13, 14, 15syl3anc 1371 . . . . . . . . . . . . . . 15 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ (𝑀 ∩ 𝐴) ∈ (𝐽 β†Ύt 𝐴))
17 simprr1 1221 . . . . . . . . . . . . . . . 16 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ 𝑦 ∈ 𝑀)
18 simplrr 776 . . . . . . . . . . . . . . . . 17 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ 𝑦 ∈ (𝑒 ∩ 𝐴))
1918elin2d 4199 . . . . . . . . . . . . . . . 16 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ 𝑦 ∈ 𝐴)
2017, 19elind 4194 . . . . . . . . . . . . . . 15 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ 𝑦 ∈ (𝑀 ∩ 𝐴))
21 opnneip 22622 . . . . . . . . . . . . . . 15 (((𝐽 β†Ύt 𝐴) ∈ Top ∧ (𝑀 ∩ 𝐴) ∈ (𝐽 β†Ύt 𝐴) ∧ 𝑦 ∈ (𝑀 ∩ 𝐴)) β†’ (𝑀 ∩ 𝐴) ∈ ((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}))
2211, 16, 20, 21syl3anc 1371 . . . . . . . . . . . . . 14 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ (𝑀 ∩ 𝐴) ∈ ((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}))
23 simprr2 1222 . . . . . . . . . . . . . . 15 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ 𝑀 βŠ† 𝑠)
2423ssrind 4235 . . . . . . . . . . . . . 14 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ (𝑀 ∩ 𝐴) βŠ† (𝑠 ∩ 𝐴))
25 inss2 4229 . . . . . . . . . . . . . . 15 (𝑠 ∩ 𝐴) βŠ† 𝐴
26 eqid 2732 . . . . . . . . . . . . . . . . . 18 βˆͺ 𝐽 = βˆͺ 𝐽
2726cldss 22532 . . . . . . . . . . . . . . . . 17 (𝐴 ∈ (Clsdβ€˜π½) β†’ 𝐴 βŠ† βˆͺ 𝐽)
2813, 27syl 17 . . . . . . . . . . . . . . . 16 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ 𝐴 βŠ† βˆͺ 𝐽)
2926restuni 22665 . . . . . . . . . . . . . . . 16 ((𝐽 ∈ Top ∧ 𝐴 βŠ† βˆͺ 𝐽) β†’ 𝐴 = βˆͺ (𝐽 β†Ύt 𝐴))
3012, 28, 29syl2anc 584 . . . . . . . . . . . . . . 15 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ 𝐴 = βˆͺ (𝐽 β†Ύt 𝐴))
3125, 30sseqtrid 4034 . . . . . . . . . . . . . 14 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ (𝑠 ∩ 𝐴) βŠ† βˆͺ (𝐽 β†Ύt 𝐴))
32 eqid 2732 . . . . . . . . . . . . . . 15 βˆͺ (𝐽 β†Ύt 𝐴) = βˆͺ (𝐽 β†Ύt 𝐴)
3332ssnei2 22619 . . . . . . . . . . . . . 14 ((((𝐽 β†Ύt 𝐴) ∈ Top ∧ (𝑀 ∩ 𝐴) ∈ ((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦})) ∧ ((𝑀 ∩ 𝐴) βŠ† (𝑠 ∩ 𝐴) ∧ (𝑠 ∩ 𝐴) βŠ† βˆͺ (𝐽 β†Ύt 𝐴))) β†’ (𝑠 ∩ 𝐴) ∈ ((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}))
3411, 22, 24, 31, 33syl22anc 837 . . . . . . . . . . . . 13 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ (𝑠 ∩ 𝐴) ∈ ((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}))
35 simprll 777 . . . . . . . . . . . . . . . 16 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ 𝑠 ∈ 𝒫 𝑒)
3635elpwid 4611 . . . . . . . . . . . . . . 15 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ 𝑠 βŠ† 𝑒)
3736ssrind 4235 . . . . . . . . . . . . . 14 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ (𝑠 ∩ 𝐴) βŠ† (𝑒 ∩ 𝐴))
38 vex 3478 . . . . . . . . . . . . . . . 16 𝑠 ∈ V
3938inex1 5317 . . . . . . . . . . . . . . 15 (𝑠 ∩ 𝐴) ∈ V
4039elpw 4606 . . . . . . . . . . . . . 14 ((𝑠 ∩ 𝐴) ∈ 𝒫 (𝑒 ∩ 𝐴) ↔ (𝑠 ∩ 𝐴) βŠ† (𝑒 ∩ 𝐴))
4137, 40sylibr 233 . . . . . . . . . . . . 13 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ (𝑠 ∩ 𝐴) ∈ 𝒫 (𝑒 ∩ 𝐴))
4234, 41elind 4194 . . . . . . . . . . . 12 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ (𝑠 ∩ 𝐴) ∈ (((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}) ∩ 𝒫 (𝑒 ∩ 𝐴)))
4325a1i 11 . . . . . . . . . . . . . . 15 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ (𝑠 ∩ 𝐴) βŠ† 𝐴)
44 restabs 22668 . . . . . . . . . . . . . . 15 ((𝐽 ∈ Top ∧ (𝑠 ∩ 𝐴) βŠ† 𝐴 ∧ 𝐴 ∈ (Clsdβ€˜π½)) β†’ ((𝐽 β†Ύt 𝐴) β†Ύt (𝑠 ∩ 𝐴)) = (𝐽 β†Ύt (𝑠 ∩ 𝐴)))
4512, 43, 13, 44syl3anc 1371 . . . . . . . . . . . . . 14 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ ((𝐽 β†Ύt 𝐴) β†Ύt (𝑠 ∩ 𝐴)) = (𝐽 β†Ύt (𝑠 ∩ 𝐴)))
46 inss1 4228 . . . . . . . . . . . . . . . 16 (𝑠 ∩ 𝐴) βŠ† 𝑠
4746a1i 11 . . . . . . . . . . . . . . 15 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ (𝑠 ∩ 𝐴) βŠ† 𝑠)
48 restabs 22668 . . . . . . . . . . . . . . 15 ((𝐽 ∈ Top ∧ (𝑠 ∩ 𝐴) βŠ† 𝑠 ∧ 𝑠 ∈ 𝒫 𝑒) β†’ ((𝐽 β†Ύt 𝑠) β†Ύt (𝑠 ∩ 𝐴)) = (𝐽 β†Ύt (𝑠 ∩ 𝐴)))
4912, 47, 35, 48syl3anc 1371 . . . . . . . . . . . . . 14 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ ((𝐽 β†Ύt 𝑠) β†Ύt (𝑠 ∩ 𝐴)) = (𝐽 β†Ύt (𝑠 ∩ 𝐴)))
5045, 49eqtr4d 2775 . . . . . . . . . . . . 13 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ ((𝐽 β†Ύt 𝐴) β†Ύt (𝑠 ∩ 𝐴)) = ((𝐽 β†Ύt 𝑠) β†Ύt (𝑠 ∩ 𝐴)))
51 simprr3 1223 . . . . . . . . . . . . . 14 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ (𝐽 β†Ύt 𝑠) ∈ Comp)
52 incom 4201 . . . . . . . . . . . . . . 15 (𝑠 ∩ 𝐴) = (𝐴 ∩ 𝑠)
53 eqid 2732 . . . . . . . . . . . . . . . . 17 (𝐴 ∩ 𝑠) = (𝐴 ∩ 𝑠)
54 ineq1 4205 . . . . . . . . . . . . . . . . . 18 (𝑣 = 𝐴 β†’ (𝑣 ∩ 𝑠) = (𝐴 ∩ 𝑠))
5554rspceeqv 3633 . . . . . . . . . . . . . . . . 17 ((𝐴 ∈ (Clsdβ€˜π½) ∧ (𝐴 ∩ 𝑠) = (𝐴 ∩ 𝑠)) β†’ βˆƒπ‘£ ∈ (Clsdβ€˜π½)(𝐴 ∩ 𝑠) = (𝑣 ∩ 𝑠))
5613, 53, 55sylancl 586 . . . . . . . . . . . . . . . 16 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ βˆƒπ‘£ ∈ (Clsdβ€˜π½)(𝐴 ∩ 𝑠) = (𝑣 ∩ 𝑠))
57 simplrl 775 . . . . . . . . . . . . . . . . . . 19 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ 𝑒 ∈ 𝐽)
58 elssuni 4941 . . . . . . . . . . . . . . . . . . 19 (𝑒 ∈ 𝐽 β†’ 𝑒 βŠ† βˆͺ 𝐽)
5957, 58syl 17 . . . . . . . . . . . . . . . . . 18 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ 𝑒 βŠ† βˆͺ 𝐽)
6036, 59sstrd 3992 . . . . . . . . . . . . . . . . 17 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ 𝑠 βŠ† βˆͺ 𝐽)
6126restcld 22675 . . . . . . . . . . . . . . . . 17 ((𝐽 ∈ Top ∧ 𝑠 βŠ† βˆͺ 𝐽) β†’ ((𝐴 ∩ 𝑠) ∈ (Clsdβ€˜(𝐽 β†Ύt 𝑠)) ↔ βˆƒπ‘£ ∈ (Clsdβ€˜π½)(𝐴 ∩ 𝑠) = (𝑣 ∩ 𝑠)))
6212, 60, 61syl2anc 584 . . . . . . . . . . . . . . . 16 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ ((𝐴 ∩ 𝑠) ∈ (Clsdβ€˜(𝐽 β†Ύt 𝑠)) ↔ βˆƒπ‘£ ∈ (Clsdβ€˜π½)(𝐴 ∩ 𝑠) = (𝑣 ∩ 𝑠)))
6356, 62mpbird 256 . . . . . . . . . . . . . . 15 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ (𝐴 ∩ 𝑠) ∈ (Clsdβ€˜(𝐽 β†Ύt 𝑠)))
6452, 63eqeltrid 2837 . . . . . . . . . . . . . 14 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ (𝑠 ∩ 𝐴) ∈ (Clsdβ€˜(𝐽 β†Ύt 𝑠)))
65 cmpcld 22905 . . . . . . . . . . . . . 14 (((𝐽 β†Ύt 𝑠) ∈ Comp ∧ (𝑠 ∩ 𝐴) ∈ (Clsdβ€˜(𝐽 β†Ύt 𝑠))) β†’ ((𝐽 β†Ύt 𝑠) β†Ύt (𝑠 ∩ 𝐴)) ∈ Comp)
6651, 64, 65syl2anc 584 . . . . . . . . . . . . 13 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ ((𝐽 β†Ύt 𝑠) β†Ύt (𝑠 ∩ 𝐴)) ∈ Comp)
6750, 66eqeltrd 2833 . . . . . . . . . . . 12 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ ((𝐽 β†Ύt 𝐴) β†Ύt (𝑠 ∩ 𝐴)) ∈ Comp)
68 oveq2 7416 . . . . . . . . . . . . . 14 (𝑣 = (𝑠 ∩ 𝐴) β†’ ((𝐽 β†Ύt 𝐴) β†Ύt 𝑣) = ((𝐽 β†Ύt 𝐴) β†Ύt (𝑠 ∩ 𝐴)))
6968eleq1d 2818 . . . . . . . . . . . . 13 (𝑣 = (𝑠 ∩ 𝐴) β†’ (((𝐽 β†Ύt 𝐴) β†Ύt 𝑣) ∈ Comp ↔ ((𝐽 β†Ύt 𝐴) β†Ύt (𝑠 ∩ 𝐴)) ∈ Comp))
7069rspcev 3612 . . . . . . . . . . . 12 (((𝑠 ∩ 𝐴) ∈ (((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}) ∩ 𝒫 (𝑒 ∩ 𝐴)) ∧ ((𝐽 β†Ύt 𝐴) β†Ύt (𝑠 ∩ 𝐴)) ∈ Comp) β†’ βˆƒπ‘£ ∈ (((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}) ∩ 𝒫 (𝑒 ∩ 𝐴))((𝐽 β†Ύt 𝐴) β†Ύt 𝑣) ∈ Comp)
7142, 67, 70syl2anc 584 . . . . . . . . . . 11 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ ((𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽) ∧ (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp))) β†’ βˆƒπ‘£ ∈ (((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}) ∩ 𝒫 (𝑒 ∩ 𝐴))((𝐽 β†Ύt 𝐴) β†Ύt 𝑣) ∈ Comp)
7271expr 457 . . . . . . . . . 10 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) ∧ (𝑠 ∈ 𝒫 𝑒 ∧ 𝑀 ∈ 𝐽)) β†’ ((𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp) β†’ βˆƒπ‘£ ∈ (((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}) ∩ 𝒫 (𝑒 ∩ 𝐴))((𝐽 β†Ύt 𝐴) β†Ύt 𝑣) ∈ Comp))
7372rexlimdvva 3211 . . . . . . . . 9 (((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) β†’ (βˆƒπ‘  ∈ 𝒫 π‘’βˆƒπ‘€ ∈ 𝐽 (𝑦 ∈ 𝑀 ∧ 𝑀 βŠ† 𝑠 ∧ (𝐽 β†Ύt 𝑠) ∈ Comp) β†’ βˆƒπ‘£ ∈ (((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}) ∩ 𝒫 (𝑒 ∩ 𝐴))((𝐽 β†Ύt 𝐴) β†Ύt 𝑣) ∈ Comp))
7410, 73mpd 15 . . . . . . . 8 (((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ (𝑒 ∈ 𝐽 ∧ 𝑦 ∈ (𝑒 ∩ 𝐴))) β†’ βˆƒπ‘£ ∈ (((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}) ∩ 𝒫 (𝑒 ∩ 𝐴))((𝐽 β†Ύt 𝐴) β†Ύt 𝑣) ∈ Comp)
7574anassrs 468 . . . . . . 7 ((((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ 𝑒 ∈ 𝐽) ∧ 𝑦 ∈ (𝑒 ∩ 𝐴)) β†’ βˆƒπ‘£ ∈ (((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}) ∩ 𝒫 (𝑒 ∩ 𝐴))((𝐽 β†Ύt 𝐴) β†Ύt 𝑣) ∈ Comp)
7675ralrimiva 3146 . . . . . 6 (((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ 𝑒 ∈ 𝐽) β†’ βˆ€π‘¦ ∈ (𝑒 ∩ 𝐴)βˆƒπ‘£ ∈ (((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}) ∩ 𝒫 (𝑒 ∩ 𝐴))((𝐽 β†Ύt 𝐴) β†Ύt 𝑣) ∈ Comp)
77 pweq 4616 . . . . . . . . 9 (π‘₯ = (𝑒 ∩ 𝐴) β†’ 𝒫 π‘₯ = 𝒫 (𝑒 ∩ 𝐴))
7877ineq2d 4212 . . . . . . . 8 (π‘₯ = (𝑒 ∩ 𝐴) β†’ (((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}) ∩ 𝒫 π‘₯) = (((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}) ∩ 𝒫 (𝑒 ∩ 𝐴)))
7978rexeqdv 3326 . . . . . . 7 (π‘₯ = (𝑒 ∩ 𝐴) β†’ (βˆƒπ‘£ ∈ (((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}) ∩ 𝒫 π‘₯)((𝐽 β†Ύt 𝐴) β†Ύt 𝑣) ∈ Comp ↔ βˆƒπ‘£ ∈ (((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}) ∩ 𝒫 (𝑒 ∩ 𝐴))((𝐽 β†Ύt 𝐴) β†Ύt 𝑣) ∈ Comp))
8079raleqbi1dv 3333 . . . . . 6 (π‘₯ = (𝑒 ∩ 𝐴) β†’ (βˆ€π‘¦ ∈ π‘₯ βˆƒπ‘£ ∈ (((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}) ∩ 𝒫 π‘₯)((𝐽 β†Ύt 𝐴) β†Ύt 𝑣) ∈ Comp ↔ βˆ€π‘¦ ∈ (𝑒 ∩ 𝐴)βˆƒπ‘£ ∈ (((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}) ∩ 𝒫 (𝑒 ∩ 𝐴))((𝐽 β†Ύt 𝐴) β†Ύt 𝑣) ∈ Comp))
8176, 80syl5ibrcom 246 . . . . 5 (((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) ∧ 𝑒 ∈ 𝐽) β†’ (π‘₯ = (𝑒 ∩ 𝐴) β†’ βˆ€π‘¦ ∈ π‘₯ βˆƒπ‘£ ∈ (((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}) ∩ 𝒫 π‘₯)((𝐽 β†Ύt 𝐴) β†Ύt 𝑣) ∈ Comp))
8281rexlimdva 3155 . . . 4 ((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) β†’ (βˆƒπ‘’ ∈ 𝐽 π‘₯ = (𝑒 ∩ 𝐴) β†’ βˆ€π‘¦ ∈ π‘₯ βˆƒπ‘£ ∈ (((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}) ∩ 𝒫 π‘₯)((𝐽 β†Ύt 𝐴) β†Ύt 𝑣) ∈ Comp))
834, 82sylbid 239 . . 3 ((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) β†’ (π‘₯ ∈ (𝐽 β†Ύt 𝐴) β†’ βˆ€π‘¦ ∈ π‘₯ βˆƒπ‘£ ∈ (((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}) ∩ 𝒫 π‘₯)((𝐽 β†Ύt 𝐴) β†Ύt 𝑣) ∈ Comp))
8483ralrimiv 3145 . 2 ((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) β†’ βˆ€π‘₯ ∈ (𝐽 β†Ύt 𝐴)βˆ€π‘¦ ∈ π‘₯ βˆƒπ‘£ ∈ (((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}) ∩ 𝒫 π‘₯)((𝐽 β†Ύt 𝐴) β†Ύt 𝑣) ∈ Comp)
85 isnlly 22972 . 2 ((𝐽 β†Ύt 𝐴) ∈ 𝑛-Locally Comp ↔ ((𝐽 β†Ύt 𝐴) ∈ Top ∧ βˆ€π‘₯ ∈ (𝐽 β†Ύt 𝐴)βˆ€π‘¦ ∈ π‘₯ βˆƒπ‘£ ∈ (((neiβ€˜(𝐽 β†Ύt 𝐴))β€˜{𝑦}) ∩ 𝒫 π‘₯)((𝐽 β†Ύt 𝐴) β†Ύt 𝑣) ∈ Comp))
863, 84, 85sylanbrc 583 1 ((𝐽 ∈ 𝑛-Locally Comp ∧ 𝐴 ∈ (Clsdβ€˜π½)) β†’ (𝐽 β†Ύt 𝐴) ∈ 𝑛-Locally Comp)
Colors of variables: wff setvar class
Syntax hints:   β†’ wi 4   ↔ wb 205   ∧ wa 396   ∧ w3a 1087   = wceq 1541   ∈ wcel 2106  βˆ€wral 3061  βˆƒwrex 3070   ∩ cin 3947   βŠ† wss 3948  π’« cpw 4602  {csn 4628  βˆͺ cuni 4908  β€˜cfv 6543  (class class class)co 7408   β†Ύt crest 17365  Topctop 22394  Clsdccld 22519  neicnei 22600  Compccmp 22889  π‘›-Locally cnlly 22968
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 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2703  ax-rep 5285  ax-sep 5299  ax-nul 5306  ax-pow 5363  ax-pr 5427  ax-un 7724
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3or 1088  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-nf 1786  df-sb 2068  df-mo 2534  df-eu 2563  df-clab 2710  df-cleq 2724  df-clel 2810  df-nfc 2885  df-ne 2941  df-ral 3062  df-rex 3071  df-reu 3377  df-rab 3433  df-v 3476  df-sbc 3778  df-csb 3894  df-dif 3951  df-un 3953  df-in 3955  df-ss 3965  df-pss 3967  df-nul 4323  df-if 4529  df-pw 4604  df-sn 4629  df-pr 4631  df-op 4635  df-uni 4909  df-int 4951  df-iun 4999  df-br 5149  df-opab 5211  df-mpt 5232  df-tr 5266  df-id 5574  df-eprel 5580  df-po 5588  df-so 5589  df-fr 5631  df-we 5633  df-xp 5682  df-rel 5683  df-cnv 5684  df-co 5685  df-dm 5686  df-rn 5687  df-res 5688  df-ima 5689  df-ord 6367  df-on 6368  df-lim 6369  df-suc 6370  df-iota 6495  df-fun 6545  df-fn 6546  df-f 6547  df-f1 6548  df-fo 6549  df-f1o 6550  df-fv 6551  df-ov 7411  df-oprab 7412  df-mpo 7413  df-om 7855  df-1st 7974  df-2nd 7975  df-1o 8465  df-er 8702  df-en 8939  df-dom 8940  df-fin 8942  df-fi 9405  df-rest 17367  df-topgen 17388  df-top 22395  df-topon 22412  df-bases 22448  df-cld 22522  df-nei 22601  df-cmp 22890  df-nlly 22970
This theorem is referenced by:  rellycmp  24472
  Copyright terms: Public domain W3C validator