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# Show That The Class P Is Closed Under Complement? Update New

Let’s discuss the question: show that the class p is closed under complement. We summarize all relevant answers in section Q&A of website Mytholi.com in category: Blog Finance For You. See more related questions in the comments below.

## Is the class P closed under complement?

P is closed under complement. For any P-language L, let M be the TM that decides it in polynomial time. We construct a TM M’ that decides the complement of L in polynomial time: M’= “On input <w>: 1.

## What operations is P closed under?

We show that P is closed under the star operation by dynamic programming. Let A be any language in P, and let M be the TM deciding A in polynomial time.

### Regular Languages Closed Under Complement Proof

Regular Languages Closed Under Complement Proof
Regular Languages Closed Under Complement Proof

## Is the complement of a language in P also in P?

Every language in P has its complement also in P, and therefore in NP.

## Is P closed under intersection?

If x /∈ A then there is NO proof that x ∈ A. The class P is closed under union, intersection, concatenation, and ∗.

## Is the class of recognizable languages closed under complement?

– Turing recognizable languages are not closed under complement.

## Is Turing recognizable closed under concatenation?

– Decidable languages are closed under complementation. To design a machine for the complement of a language L, we can simulate the machine for L on an input. If it accepts then accept and vice versa. – Turing recognizable languages are not closed under complement.

## What is NP problem?

That is, co-NP is the set of decision problems where there exists a polynomial p(n) and a polynomial-time bounded Turing machine M such that for every instance x, x is a no-instance if and only if: for some possible certificate c of length bounded by p(n), the Turing machine M accepts the pair (x, c).

## Is linear on?

An algorithm is said to take linear time, or O(n) time, if its time complexity is O(n). Informally, this means that the running time increases at most linearly with the size of the input.

## What is Kleene star automata?

Definition − The Kleene star, ∑*, is a unary operator on a set of symbols or strings, ∑, that gives the infinite set of all possible strings of all possible lengths over ∑ including λ.

## How do you show a language in P?

To prove that a given language is in P: Construct an algorithm that decides the language. This algorithm may “call” any other algorithms from the textbook, lectures, class handouts, or homework assignments (but you should cite the appropriate reference).

## Is a set of languages whose complement is in NP?

Since language L is NP-Complete all NP and NP Complete problems can be reduced to L in polynomial time. And it is given that complement of language L is in NP. Hence complement of all NP problems is in NP.

## What is the complement of NP?

The complement of an NP-complete problem is co-NP-complete; if any co-NP-complete problem is in a class C that is closed under polynomial-time reductions, then every co-NP⊆C; NP is closed under polynomial-time reductions.

### Regular Languages Closed Under Complement Proof

Regular Languages Closed Under Complement Proof
Regular Languages Closed Under Complement Proof

## Is NP closed under concatenation?

NP is closed under concatenation. For any two NP languages L1 and L2, let M1,M2 be the NTMs that decide them in polynomial time. We construct a NTM N1 that decides L1L2 in polynomial time: N1 = “On input string w: 1.

## Is NP closed under star?

NP is closed under Kleene star. Given a NTM N which decides L 2 NP in nondeterministic polynomial time, the following NTM N0 decides L⇤ in nondeterministic polynomial time.

## Is NP closed under union?

NP is closed under union, intersection, and concatenation; but is not known to be closed under complement.

## Is complement of recognizable language recognizable?

Theorem: A language is decidable iff both it and its complement are recognizable. Proof: Surely, a decidable language is recognizable. Moreover, if a language is decidable, then so is its complement, and hence that complement is recognizable.

## Is the complement of a recognizable language also recognizable?

Flipping the accept and reject states generates a TM to decide the complement of this language. Not all Recognizable languages are closed under complement. If the complement of a recognizable language is also recognizable, the language is, in fact, decidable.

## Is the complement of a Turing recognizable language Turing recognizable?

That is, a TM that accepts any input . A Language L is co-Turing recognizable if the complement of L, , is Turing recognizable. A language L Is decidable, if and only if it is Turing recognizable and co-Turing recognizable. If L is decidable so is its complement, .

## What are Turing recognizable languages closed under?

Turing recognizable languages are closed under union and intersection. Explanation: A recognizer of a language is a machine that recognizes that language. A decider of a language is a machine that decides that language.

## Are recursive languages closed under complement?

Recursively enumerable languages are closed under complement. Proof. Same as previous machine. This fails because M only needs to halt if w in L(M) – doesn’t have to say “no”.

## Is Re closed under union?

A language is recursive if it is the set of strings accepted by some TM that halts on every input. For example, any regular language is recursive. Fact. (a) The set of r.e. languages is closed un- der union and intersection.

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## What is DSA Class P?

The class P consists of those problems that are solvable in polynomial time, i.e. these problems can be solved in time O(nk) in worst-case, where k is constant. These problems are called tractable, while others are called intractable or superpolynomial.

### 16. Complexity: P, NP, NP-completeness, Reductions

16. Complexity: P, NP, NP-completeness, Reductions
16. Complexity: P, NP, NP-completeness, Reductions

## What is P and NP class problems?

NP is set of problems that can be solved by a Non-deterministic Turing Machine in Polynomial time. P is subset of NP (any problem that can be solved by deterministic machine in polynomial time can also be solved by non-deterministic machine in polynomial time) but P≠NP.

## What is P and NP class in automata?

Step 1 − If a problem is in class P, it is nothing but we can find a solution to that type of problem in polynomial time. Step 2 − If a problem is in class NP, it is nothing but that we can verify a possible solution in polynomial time.

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