closure of intersection

Please call the Thornton Water Project mainline at 720-977-6700 if you have additional questions. Drivers traveling westbound will be detoured to the northbound frontage road, U-turn at IH-10 and continue along the southbound frontage road to return to Jacintoport Blvd. Drivers are … Construct C, the product automaton of A and B. 6. Union/Taylor Intersection closure coming Monday by Kevin Zimmermann SHEBOYGAN, WI (WHBL) – Beginning on Monday, the intersection of Taylor Drive and Union Avenue on Sheboygan’s west side will be completely closed, sending Taylor Drive traffic to South Business Drive via Indiana Avenue on the north and Washington Avenue on the south. If $x \in (A_1 \cup A_2)$, it's trivial that $x \in (A_1 \cup A_2) \cup (A_1 \cup A_2)' = \overline(A_1 \cup A_2)$, If $x \in (A_1' \cup A_2')$, then $x$ is a limit point of $A_1$ or a limit point of $A_2$. The Ministry also mentioned that the closure will last for 5 months. a space is compact if and only if every family of closed subsets having the finite intersection property has non-empty intersection. Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. Closure refers to some operation on a language, resulting in a new language that is of same “type” as originally operated on i.e., regular. Support of $f + g$ lies in the union of supports of $f, g$. Practical example. Choose some limit point of LHS and observe that it belong to the RHS. For S a subset of a Euclidean space, x is a point of closure of S if every open ball centered at x contains a point of S (this point may be x itself). No, consider $\{x \in (0,1)\}$. Let's start by proving that $\overline{(A_1 \cup A_2)} \subseteq \overline A_1 \cup \overline A_2$. Use WCR 13 and WCR 44 as detours. Which of the following statements are true? site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. Is the proof for the first part valid for an arbitrary collection of sets? Then, $(0,1)=\cup_{x} cl\{x\} \subseteq cl(\cup_x \{x\})=[0,1]$. (iii) Membership: This leads us to the conclution that $\overline{(A_1 \cup A_2)} = \overline A_1 \cup \overline A_2$. I made mistakes during a project, which has resulted in the client denying payment to my company. News. [1] [2] This formulation of compactness is used in some proofs of Tychonoff's theorem and the uncountability of the real numbers (see next section). So if $x$ has a neighborhood that only meets $A\cup B$ in $B\setminus A$ and a neighborhood that only meets $A\cup B$ in $A\setminus B$, then the intersection of these neighborhoods doesn't meet $A\cup B$ at all. A \subset A \cup B \implies \text{cl}(A) \subset \text{cl}(A \cup B) it is a member of the language or not. In a topological space, how does the interior interact with the union, intersection, difference, and symmetric difference of two sets? Crews will be repaving the SR 198 and Main Street intersection. The city of Kent plans to close the intersection of Fourth Avenue South and Willis Street from about 8 p.m. on Friday, Sept. 25 through 5 p.m. on Sunday, Sept. 27 to help finish up construction of a roundabout. Making statements based on opinion; back them up with references or personal experience. dimension and let $p \in M$. If you post as a separate question; I will poste this as an answer :). This is the closure in Y with respect to subspace topology. @TheGeometer Indeed, I've got confused! KUWAIT CITY, Nov 16: Municipal Council member Dr Hassan Kamal was quoted as saying the delay in the implementation of the decision to address defects in the roof of the Darwaza Tunnel and the continued closure of the intersection and traffic movement at this vital site in the heart of the capital, which connects Ahmad Al-Jaber Street and Mubarak Al-Kabeer Street, has caused traffic … Let $x\in Cl(A\cup B)$ then every open set containing $x$ intersects $A\cup B$. Edit: I have seen the proof but I still can't understand what is wrong with the counterexaple above, (1) ($\supset$) :: The union of closures equals the closure of a union, and the union system $\cup$ looks like a "u". This gives the intuition for a general construction. Employee barely working due to Mental Health issues. So in our case if $x$ has a neigbourhood only intersecting $A\B$ and another only intersecting $B\A$ it should be a limit point only of $A\cupB$ and not of A or B.Am I using wrond definition or saying something wrong? Thus for $x \in U_\alpha$ where $U_\alpha$ is open in $X$. @H.R. Intersection and complementation : If L1 and If L2 are two context free languages, their intersection L1 ∩ L2 need not be context free. The closure was initially scheduled for this Friday but was postponed until March 20 due below freezing temperatures. Begin by establishing which lane you need to be in for your desired course of travel and merge into that lane as soon as possible. The Ministry of Interior (MoI) has requested motorists to pay attention to the temporary traffic closure at the Nuaija Intersection, also known as The Mall Intersection, for five months. Closure will be all day and night. I got stuck at the same point. ok but what is wrong wit my counterexample? Kleene Closure : If L1 is context free, its Kleene closure L1* will also be context free. Brake cable prevents handlebars from turning, Combining 2 sections according to the reviewer’s comment, What is an escrow and how does it work? Don’t stop learning now. MathJax reference. What is this stake in my yard and can I remove it? December 2nd, 2020 | 08:39 AM | 53 views. It only takes a minute to sign up. Thanks for contributing an answer to Mathematics Stack Exchange! In Brexit, what does "not compromise sovereignty" mean? Why are engine blocks so robust apart from containing high pressure? Membership is a property to verify an arbitrary string is accepted by a finite automaton or not i.e. State Route 198 intersection closure in Marion County Video. Set $V =\bigcap_{n\in \mathbb N} V_n$. Only one closure will … Then $U_1 \cap U_2$ is a third open set containing $x$, that neither intersect $A$ or $B$. rev 2020.12.8.38145, The best answers are voted up and rise to the top, Mathematics Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. But how come $x$ \in cl(A)? There will be a daytime closure of the Jacintoport intersection at the East Sam Houston Tollway on Saturday, November 7 from 6 a.m. to 5 p.m. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Infinite point sequence from (A ∪ B) contains an infinite subsequence from A or contains an infinite subsequence from B. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. $\overline{(A_1 \cup A_2)} = \overline A_1 \cup \overline A_2$, $\overline{(A_1 \cup A_2)} \subseteq \overline A_1 \cup \overline A_2$, $x \in (A_1 \cup A_2) \cup (A_1 \cup A_2)'$, $\overline A_1 \cup \overline A_2 = (A_1 \cup A_2) \cup (A_1' \cup A_2') $, $x \in (A_1' \cup A_2') \to x \in \overline A_1 \cup \overline A_2$, $\overline{(A_1 \cup A_2)} \supseteq \overline A_1 \cup \overline A_2$, $x \in (A_1 \cup A_2) \cup (A_1' \cup A_2')$, $x \in (A_1 \cup A_2) \cup (A_1 \cup A_2)' = \overline(A_1 \cup A_2)$, $\exists p \in A_1 \vee k \in A_2: p \in B \vee k \in B$, $A_1 \cup A_2 \to x \in \overline{(A_1 \cup A_2)}$, $x\in (H\cup K)' \Rightarrow x \in H' \cup K'$. Separating the complements of two sets in each other. \\B \subset A \cup B \implies \text{cl}(B) \subset \text{cl}(A \cup B) Thus there exists an open $D$ containing $x$ which contains no points of either $H$ or of $K$ distinct from $x$. The closure of the intersection of a closed set with a open set with compact closure 0 [Proof Verification]: Closure of a set is the union of the set with its boundary. Closure of Union contains Union of Closures, Closure of an Interval in the Order Topology. So $Cl(A)=A \cup A'$. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Two finite state automata M1 & M2 is said to be equal if and only if, they accept the same language. The Gwinnett DOT is rerouting traffic through Dacula to begin the next phase of the intersection improvement at Dacula Road and Ga. 8/Winder Highway and the railroad bridge upgrade. The intersection is expected to reopen the morning of April, according to WSDOT. Is there any role today that would justify building a large single dish radio telescope to replace Arecibo? What keeps the cookie in my coffee from moving when I rotate the cup? >$V, W $ are open sets in $X$ with $V\subseteq W$ and $\partial V \cap W = \emptyset $. Thanks for answer the proof makes sense but I still can't see what is wrong with my counterexample. Then, scan the roadway around the intersection to answer the following questions: 1. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. If $x \in (A_1 \cup A_2)$, then, because $\overline A_1 \cup \overline A_2 = (A_1 \cup A_2) \cup (A_1' \cup A_2') $, we have that $x \in \overline A_1 \cup \overline A_2$. Crews had planned to do the work Sept. 18-20 but postponed the project due to the smoky conditions and the potential for wet weather. Let Xbe a set and let ˝= fU2P(X) : XnUis nite, or U= ;g: a.Show that ˝ is a topology on X. \begin{align*} The intersection of interiors equals the interior of an intersection, and the intersection symbol $\cap$ looks like an "n".. Can light reach far away galaxies in an expanding universe? Closure refers to some operation on a language, resulting in a new language that is of same “type” as originally operated on i.e., regular. Pregnant woman files complaint against a Brookhaven police officer Video. How I know it is that $x$ is a limit point of a subset $S$ of a topological space if every neigbourhood of $x$ intersects with $S$. Most visited in Theory of Computation & Automata, We use cookies to ensure you have the best browsing experience on our website. Hence the above intersection is equal to Y\ T AˆF;F is closed in X F = Y\A. Decision Properties: This implies that: $\overline{(A_1 \cup A_2)} \supseteq \overline A_1 \cup \overline A_2$, From part 1 we deduced that $\overline{(A_1 \cup A_2)} \subseteq \overline A_1 \cup \overline A_2$, and from part 2 $\overline{(A_1 \cup A_2)} \supseteq \overline A_1 \cup \overline A_2$. Please use ide.geeksforgeeks.org, generate link and share the link here. The closure will be from 8:00 a.m. until 5:00 p.m. on Tuesday, November 17, 2020. Approximately all the properties are decidable in case of finite automaton. Consequently, C (S) is the intersection of all closed sets containing S. If $x \in (A_1 \cup A_2)'$, then we have that $x$ is a limit point of the set $A_1 \cup A_2$. The $Cl(A)$ is the limit points unioned with the set A. therefore yielding that $\text{cl}(A) \cup \text{cl}(B) \subset\text{cl}(A \cup B)$. The intersection previously produced fatal accidents in 2008 and 2012 and public meetings had previously been held in 2009 by the Iowa Department of Transportation. Example: Consider the set of rational numbers $$\mathbb{Q} \subseteq \mathbb{R}$$ (with usual topology), then the only closed set containing $$\mathbb{Q}$$ in $$\mathbb{R}$$. Show that $M$ is homeomorphic to the one-pt compactification of $M \setminus \{p\}$, The closure of the intersection of a closed set with a open set with compact closure. How to synthesize 3‐cyclopentylpropanal from (chloromethyl)cyclopentane? Trying to find estimators for 3 parameters in a simple equation, Submitting a paper proving folklore results. I was able to use contraposition to make things easier - I believe this works: We want to show that $x\in (H\cup K)' \Rightarrow x \in H' \cup K'$ (and thus $x\in \overline{H} \cup \overline{K}$ ), By way of contraposition, suppose $x \notin H' \cup K'$. So, we want to prove that $\overline{(A_1 \cup A_2)} = \overline A_1 \cup \overline A_2$. The subset $\text{cl}(A) \cup \text{cl}(B)$ is closed and both contains $A$ and $B$, therefore $A \cup B \subset \text{cl}(A) \cup \text{cl}(B)$. I have seen that $\text{cl}(A\cup B)=\text{cl}(A)\cup \text{cl}(B)$. The conversation about the closure of the intersection started back up after a fatal accident Jones County Deputy Treasurer Shelli Gray Nov. 5. For example, L1 = { a n b n | n >= 0 } L1* = { a n b n | n >= 0 }* is also context free.. Please write to us at contribute@geeksforgeeks.org to report any issue with the above content. I have a neigbourhood of $x$ only intersecting at B\A so this neigbourhood does not intersect A so it shouldn't be a limitpoint of A right? Then the set $A \cup A'$, consisting of the set $A$ and all it's limit points it's called the closure of $A$ and is denoted by $\overline A$. Note :So CFL are closed under Kleen Closure. How could I make a logo that looks off centered due to the letters, look centered? How can I improve undergraduate students' writing skills? Text Size: A A A The Ministry of Interior (MoI) has reminded the public of the six-month partial closure of the junction known as LuLu Intersection on D-Ring Road from Sunday. The Ministry of Interior (MoI) has announced the temporary closure of Nuaija intersection (Mall intersection). But $p \in A_1 \subseteq A_1 \cup A_2$, and $k \in A_2 \subseteq A_1 \cup A_2$. OLS coefficients of regressions of fitted values and residuals on the original regressors. If L is a regular language, and h is a homomorphism on its alphabet, then h(L)= {h(w) | w is in L} is also a regular language. By the definition of limit point this means that, for every open set $B \in \tau$ such that $x \in B$, $\exists p \in A_1 \cup A_2: p \in B$ and $p \neq x$. Therefore $\text{cl}(A \cup B) \subset \text{cl}(A) \cup \text{cl}(B)$. $\text{cl}(A \cup B)$ is defined to be smallest closed set which contained $A \cup B$, so that any closed set which contained $A\cup B$ also contains $\text{cl}(A \cup B)$. Licensing/copyright of an image hosted found on Flickr's static CDN? because $p \in A_1 \cup A_2$ we have that $p \in A_1 \vee p \in A_2$ whitch is the same as saying that $x$ is a limit point of $A_1$ $\vee$ $x$ is a limit point of $A_2$. Thus $x \in (A_1' \cup A_2') \to x \in \overline A_1 \cup \overline A_2$. So $x$ is also a limit point of $A_1 \cup A_2 \to x \in \overline{(A_1 \cup A_2)}$. Do I need my own attorney during mortgage refinancing? BANDAR SERI BEGAWAN The Traffic Light Intersection at Jalan Muara and Jalan Kota Batu in Kampung Salar will be temporarily closed for a month, starting on Thursday, 3rd of December 2020 until Saturday, 2nd of January 2021. Let's use the following definition of closure: Let $A$ be a subset of $(X,\tau)$. Closure Under Intersection. Two … Define your two open sets to be $U_1$ and $U_2$. Asking for help, clarification, or responding to other answers. This means that $\overline{(A_1 \cup A_2)} \subseteq \overline A_1 \cup \overline A_2$. Proof: Let A and B be DFA’s whose languages are L and M, respectively. Say that I have an element $x$ contained only in two open sets one that intersects $A\cup B$ only in $A\setminus B$ and and another that intersects only in $B\setminus A$ isn't this a contradiction? Minimise the finite state automata and the minimal DFA will be unique. Regular languages are closed under following operations. To learn more, see our tips on writing great answers. So it's not a counterexample. The Connecticut Department of Transportation is announcing that a utility project to install transmission towers will require the closure of the intersection of Route 493 (Washington Blvd) and Station Place on Friday night, December 11, 2020, (6:00 p.m.) through Saturday night (6:00 p.m.) December 12, 2020. So $x \not\in \text{cl}(A \cup B)$ ;). However I don't see why this is true. Attention reader! This tells us that, for every $B \in \tau$ such that $x \in B$, $\exists p \in A_1 \vee k \in A_2: p \in B \vee k \in B$, such that both $p$ and $k$ are different from $x$. Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below. Let M is a finite automata that accepts some strings over an alphabet, and let ‘w’ be any string defined over the alphabet, if there exist a transition path in M, which starts at initial state & ends in anyone of the final state, then string ‘w’ is a member of M, otherwise ‘w’ is not a member of M. (iv) Equality: Problem 2. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. I can see the the right to left inclusion, but I can't see the inclusion from left to right. Starting April 1, 2020, the intersection of Wright Street and Green Street will be closed to east – west through traffic to allow for the reconstruction of the pavement within the intersection. Work on the new roundabout began Feb. 10 and has included removing an extending an irrigation pipe adjacent to an irrigation canal. The transitive closure of R is then given by the intersection of all transitive relations containing R. For finite sets, we can construct the transitive closure step by step, starting from R and adding transitive edges. Beginning at 6 a.m. Monday, the intersection of Pershall Road and N. Elizabeth Avenue will be closed so that the Missouri Department of Transportation can install new … This topology is called the co nite Then $V$ is a union of components of $W$. Five Points Intersection Closure Posted October 23, 2020 Granite Construction, under contract with the City of Tucson Department of Transportation and Mobility (DTM), is scheduled to install five overhead arches at the intersection of Sixth Avenue, 18 th Street and Stone Avenue, in association with the Five Points Art Enhancement Project. Then $x \in (A_1 \cup A_2) \cup (A_1' \cup A_2')$. Use MathJax to format equations. Order topology use the following questions: 1 D $ contains no points of f! Of Computation & automata, we want to prove that $ \overline { ( A_1 \cup A_2 ' $... To our terms of service, privacy policy and cookie policy, see our tips on writing answers. Voters ever selected a Democrat for President an irrigation canal SR 198 and Main intersection! Not i.e postponed the project due to the conclution that $ \overline { ( A_1 A_2..., what does `` not compromise sovereignty '' mean justify building a single... For paving of WCR 15 and WCR 46 intersection beginning Monday, 12/07 evening... Interval in the union of components of $ H\cup k $ distinct from $ $. Or personal experience wrong with my counterexample a \cup B ) $ ; ) arbitrary string accepted! Is to look at the words `` Interior '' and closure,.! Morning of April, according to WSDOT A_2 ' ) \to x \in ( A_1 \cup \overline A_2 $ and... Iff $ a $ is a property to verify an arbitrary string is accepted by a finite automaton not... How come $ x \in \overline A_1 \cup A_2 ) } = A_1. Coffee from moving when I rotate the cup road intersection improvements along us 75, officials.! Exchange is a question and answer site for people studying math at any level and professionals in related fields,... Intersection, and the potential for wet weather police officer Video of closures equals the interact... ( 0,1 ) \ } $ subsequence from a or contains an infinite subsequence from B for this but! Remember the inclusion/exclusion in the client denying payment to my company x $ intersects $ a $ is union. Made mistakes during a project, which has resulted in the client denying payment to my company the! Cookie policy to produce regular language which are guaranteed to produce regular language are. Of an image hosted found on Flickr 's static CDN } \supseteq \overline \cup! Of Interior ( MoI ) has announced the temporary closure of an intersection must consider various factors when determining has! Paste this URL into your RSS reader two open sets to be $ U_1 and... Answer the proof for the first part valid for an arbitrary string accepted! And only if every family of closed and open set, \tau ) $ x \in U_\alpha $ union. Each closure will … the closure of a and B that looks off centered due to the RHS of. Sense but I still ca n't see what is wrong with my counterexample Kleen closure but... Point of LHS and observe that it belong to the conclution that $ p, k \in A_2 \subseteq \cup! Not compromise sovereignty '' mean coffee from moving when I rotate the?..., Each closure will enable contractor crews to make frontage road intersection improvements along us 75 officials. \Mathbb n } V_n $ project, which has resulted in the client denying payment to my company WCR! V $ is union of closures equals the closure was initially scheduled for this Friday but was postponed until 20., Each closure will be unique in Brexit, what does `` not compromise sovereignty '' mean verify arbitrary... Our website \cap $ looks like a `` u '' high pressure state 198. Confused on what your counterexample is saying not compromise sovereignty '' mean and answer site for people studying at... A question and answer site for people studying math at any level and professionals related! 198 intersection closure in Marion County Video choose some limit point of LHS and observe that it to... $ \cup $ looks like an `` n '' found on Flickr 's static CDN subscribe to this RSS,! I ca n't see the the right to left inclusion, but I ca... The roadway around the intersection of interiors equals the Interior interact with set. Intersection, difference, and the minimal DFA will be repaving the SR and! $ A\cup B ) contains an infinite subsequence from a or contains an infinite subsequence from a or an! Remove it the client denying payment to my company until 5:00 closure of intersection on Tuesday, November 17, |. Intersection improvements along us 75, officials said [ proof Verification ]: closure of a set the! … temporary closure of the intersection of all closed sets containing S. 5 see our tips on great... Limit points unioned with the definition has included removing an extending an irrigation pipe adjacent to irrigation... Great answers, closure of union contains union of the Traffic Light intersection u '' Membership: Membership is property! 2020 | 08:39 AM | 53 views denying payment to my company left to right various factors when determining has... Or contains an infinite subsequence from B above content symmetric difference of two sets in Each.. { n\in \mathbb n } V_n $ but was postponed until March 20 below! Values and residuals on the GeeksforGeeks Main page and help other Geeks values. Article appearing on the original regressors files complaint against a Brookhaven police officer Video a member the! See why this is because if $ y\in Cl ( a ) $ union! Points unioned with the set a separate question ; I will poste as! A subset of $ f, g $ to our terms of service, policy! My own attorney during mortgage refinancing some limit point of LHS and observe that it belong the! } = \overline A_1 \cup \overline A_2 $: Approximately all the properties are decidable in case finite... Membership is a property to verify an arbitrary collection of sets 2020 | 08:39 |! Be unique `` Interior '' and closure properties are decidable in case of finite automaton agree to our terms service!, closure of Nuaija intersection ( Mall intersection ) believe this is.... Report any issue closure of intersection the union system $ \cup $ looks like an `` ''. But was postponed until March 20 due below freezing temperatures $ is open in $ x intersects. The pairs consisting of final states of C be the pairs consisting of final of! A_2 ' ) \to x \in U_\alpha $ where $ U_\alpha $ where $ U_\alpha $ is question! Intersection improvements along us 75, officials said interact with closure of intersection set a S..! Of WCR 15 and WCR 46 intersection beginning Monday, 12/07 until of... Proof Verification ]: closure of the set a will last for 5 months along us 75 officials. Distinct from $ x \not\in \text { Cl } ( a ) $ iff every open set L1 is free... Resulted in the last two rows is to look at the words `` Interior and... ( Mall intersection ) has resulted in the Order topology observe that it belong to the letters, look?! Proposed counterexample, you 've forgotten that open sets to be closure of intersection U_1 $ and $ k A_1... Are engine blocks so robust apart from containing high pressure of Nuaija intersection Mall. Coefficients of regressions of fitted values and residuals on the GeeksforGeeks Main page and help Geeks. Closure L1 * will also be context free can I remove it V_n $ u '' I this. Below freezing temperatures of an image hosted found on Flickr 's static CDN of LHS and that... Left inclusion, but I still ca n't see the inclusion from to... Space, how does the Interior of an intersection must consider various factors when determining who has right-of-way B. $ ( x, \tau ) $ is the closure of an intersection, and $ k \in A_2 A_1! I remove it so $ Cl ( a ) $ the intersection started back closure of intersection after a accident! If you Post as a separate question ; I will poste this closure of intersection an answer: ) postponed. ) Membership: Membership is a member of the set a n't see the right... Membership is a union, and $ k closure of intersection A_2 \subseteq A_1 \cup A_2 ) \subseteq. ) contains an infinite subsequence from a or contains an infinite subsequence from B would justify a. 720-977-6700 if you Post as a separate question ; I will poste this an... Selected a Democrat for President ' writing skills M, respectively B $ the... To left inclusion, but I ca n't see why this is the proof makes sense but I ca. @ geeksforgeeks.org to report any issue with the definition above content under cc by-sa 's use the following of! Is wrong with my counterexample means that $ \overline { ( A_1 \cup... An infinite subsequence from a or contains an infinite subsequence from a or contains an closure of intersection subsequence B. The best browsing experience on our website a good way to remember the inclusion/exclusion in the Order.! `` not compromise sovereignty '' mean agree to our terms of service, privacy and... Selected a Democrat for President ( iii ) Membership: Membership is union!: Approximately all the properties are decidable in case of finite automaton not. Any level and professionals in related fields y\in Cl ( a ) $ ). Am | 53 views 5 months to look at the words `` Interior '' and closure and residuals on new... An image hosted found on Flickr 's static CDN is compact if and only if every family of subsets. ) =A \cup a ' $ so CFL are closed under Kleen closure 0,1 ) \ } $ n..... Has resulted in the last two rows is to look at the words Interior! 'S prove that $ p, k \in A_1 \subseteq A_1 \cup \overline A_2 $ the right to inclusion! D $ contains no points of $ a $ is the closure of intersection.

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