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• give example of 2 languages A and B such that A and B are undecidable but there concatenation A.B is decidable. Let \$B\$ contain all odd-length strings, plus the empty string, plus an undecidable collection of even-length strings.
In computability theory and computational complexity theory, an undecidable problem is a decision problem for which it is impossible to construct an algorithm that leads to a yes or no answer the problem is not decidable.A decision problem is any
• Thus, language L is decidable and recognizable. 12. Let S be an uncountable set of languages over {0, 1}. Let L ∈ S. Then L is (all / some / no) decidable. Solution: Let S be the set of all languages. As we saw earlier, S is uncountable. Yet, ∅ ∈ S, which is a decidable language. At the same time, L ACC ∈ S, which is undecidable. 13.

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Decidable Languages A language L is called decidable iff there is a decider M such that (ℒ M) = L. Given a decider M, you can learn whether or not a string w ∈ (ℒ M). Run M on w. Although it might take a staggeringly long time, M will eventually accept or reject w. The set R is the set of all decidable languages. L ∈ R iff L is decidable

Decidable language -A decision problem P is said to be decidable (i.e., have an algorithm) if the language L of all yes instances to P is decidable. Example- (I) (Acceptance problem for DFA) Given a DFA does it accept a given ; Is the state entry problem an undecidable problem? But we know that is not possible because the halting problem is ... Lecture 12: Undecidable Languages. Ryan Bernstein. 1 Introductory Remarks. By constructing Turing machines that decided all of these languages, we showed that they were Turing-decidable. Today, we'll be looking at languages that are not Turing-decidable.Lecture 12: Undecidable Languages. Ryan Bernstein. 1 Introductory Remarks. By constructing Turing machines that decided all of these languages, we showed that they were Turing-decidable. Today, we'll be looking at languages that are not Turing-decidable.

Problem 2. (10 points) is the language DISJOINTTM = {(M,N):M and N are TMs and L(M) n L(N) = 0} decidable or undecidable? Prove your answer. Show transcribed image text Problem 2.
1 Decidable and Undecidable Languages The Halting Problem and The Return of Diagonalization CS235 Languages and Automata Tuesday, November 23, and Wednesday, November 24, 2010

If a language is not decidable, we call it undecidable. Example (Life on Mars, [1]). • Are any languages undecidable, and if so, how do we prove it? • We will rst prove that a particular problem is undecidable. • After nding such a problem, we can show undecidability of other problems using a.

of this problem have a decidable int Reg-problem. Finally, we present a graph problem on directed multi-hyper-graphs with an undecidable int Reg-problem. This contrasts the results in [27] where classes of graph problems with a decidable int Reg-problem are identi ed. We expect the reader to be familiar with regular languages and their descrip-
In the previous lecture we saw a few examples of undecidable languages: DIAG is not semidecidable, and therefore not decidable, while ADTM and HALT are semide-cidable but not decidable.

Problem 2. (10 points) is the language DISJOINTTM = {(M,N):M and N are TMs and L(M) n L(N) = 0} decidable or undecidable? Prove your answer. Show transcribed image text Problem 2. Let hi : Theorem 3: Specification Template Synthesis Problem is ΣT 7→ Σi be a bijective map that maps events in ΣT to events undecidable.SThat is, given a schematic regular language n in Σi for each i ∈ [1, n], such that hi (σ) = σ, if σ ∈ Σg L(n) over i=1 Σi parameterized by n, it is undecidable and hi (σ) = (σ, i), if σ ∈ ... In the previous lecture we saw a few examples of undecidable languages: DIAG is not semidecidable, and therefore not decidable, while ADTM and HALT are semide-cidable but not decidable.Decidable language -A decision problem P is said to be decidable (i.e., have an algorithm) if the language L of all yes instances to P is decidable. Example- (I) (Acceptance problem for DFA) Given a DFA does it accept a given ; Is the state entry problem an undecidable problem? But we know that is not possible because the halting problem is ...

Explain clearly and in detail why the two parts above imply that SUBSET TM is undecidable, not semi-decidable, and not co-semi-decidable. Consider the following language: LOOPS TM = { <M> | M is a Turing machine and there is at least one word w in Sigma* such that M doesn't halt (i.e. it loops) when it is run on input w}.

Examples. More Undecidable Problems. What's a "Language"? Slide Number 51. CS311 Computational Structures. Decidable and Undecidable Problems. An unrecognizable language. • A language L is decidable ⇔ both L and L. are Turing-recognizable.Dec 07, 2015 · December 7, 2015 by Arjun Suresh 12 Comments. Heads Up! Please do not by heart this table. This is just to check your understanding. Grammar: Decidable and Undecidable Problems. Grammar. w ∈ L ( G) L ( G) = ϕ. L ( G) = Σ ∗.

Dec 07, 2015 · December 7, 2015 by Arjun Suresh 12 Comments. Heads Up! Please do not by heart this table. This is just to check your understanding. Grammar: Decidable and Undecidable Problems. Grammar. w ∈ L ( G) L ( G) = ϕ. L ( G) = Σ ∗.

Thus, language L is decidable and recognizable. 12. Let S be an uncountable set of languages over {0, 1}. Let L ∈ S. Then L is (all / some / no) decidable. Solution: Let S be the set of all languages. As we saw earlier, S is uncountable. Yet, ∅ ∈ S, which is a decidable language. At the same time, L ACC ∈ S, which is undecidable. 13. A decidable language • To show that a language is decidable, we have to describe an algorithm that decides it ‣We’ll allow informal descriptions as long as we are confident they can in principle be turned into TMs • Consider ADFA = { M,w ⃒M is a DFA that accepts w } • Algorithm: Check that M is a valid encoding; if not reject.

In computability theory and computational complexity theory, an undecidable problem is a decision problem for which it is impossible to construct an algorithm that leads to a yes or no answer the problem is not decidable.A decision problem is any

If a language is both semi-decidable and co-semi-decidable, then it is decidable. Universal language A TM = fhM;wijw2L(M)g. Undecidability; proof by diagonalization and getting the paradox. A TM is undecidable. A many-one reduction: A m Bif exists a computable function fsuch that 8x2 A, x2A f(x) 2B. To prove that Bis undecidable, (not semi ...

If a language is not decidable, we call it undecidable. Example (Life on Mars, [1]). • Are any languages undecidable, and if so, how do we prove it? • We will rst prove that a particular problem is undecidable. • After nding such a problem, we can show undecidability of other problems using a.Thus, language L is decidable and recognizable. 12. Let S be an uncountable set of languages over {0, 1}. Let L ∈ S. Then L is (all / some / no) decidable. Solution: Let S be the set of all languages. As we saw earlier, S is uncountable. Yet, ∅ ∈ S, which is a decidable language. At the same time, L ACC ∈ S, which is undecidable. 13. forever. Also with recursively enumerable (Type 0) languages as deﬁned earlier. The halting set {T s | T halts on input s} is an example a semidecidable set that isn’t decidable. So there exist Type 0 languages for which membership is undecidable. 9/13

Decidable language -A decision problem P is said to be decidable (i.e., have an algorithm) if the language L of all yes instances to P is decidable. Example- (I) (Acceptance problem for DFA) Given a DFA does it accept a given ; Is the state entry problem an undecidable problem? But we know that is not possible because the halting problem is ... Lecture 12: Undecidable Languages. Ryan Bernstein. 1 Introductory Remarks. By constructing Turing machines that decided all of these languages, we showed that they were Turing-decidable. Today, we'll be looking at languages that are not Turing-decidable.Aug 31, 2014 · Decidable and undecidable problems. deciding regular languages and CFL’s Undecidable problems. Deciding CFLs. Useful to have an efficient algorithm to decide whether string x is in given CFL e.g. programming language often described by CFG. Determine if string is valid program.

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Decidable and Undecidable problems. The boundary between decidability and undecidability is often quite delicate. seemingly related problems one decidable other undecidable. We will cover most examples in the problem sheet. Problem: Given a context free grammar G , is the language it...Aug 31, 2014 · Decidable and undecidable problems. deciding regular languages and CFL’s Undecidable problems. Deciding CFLs. Useful to have an efficient algorithm to decide whether string x is in given CFL e.g. programming language often described by CFG. Determine if string is valid program.