Question: Problem 2: Let L1 and L2 be two languages over the same alphabet . The concatenation of L1 and L2 is the language {xy |

Problem 2: Let L1 and L2 be two languages over the same alphabet . The concatenation of L1 and L2 is the language {xy | x L1, y L2}. That is, the set of strings where some prefix of the string is in L1 and the rest is in L2. Prove that if L1 and L2 are both decidable then the concatenation of L1 and L2 is decidable.

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock blur-text-image

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Databases Questions!

Let L1 and L2 be two languages produced by grammars of a certain type. Let L be the language which is the concatenation of L1 and L2. We want to tell for various types of grammars that produce L1 and...

Question 2 Please! Problem 1: Let L1 and L2 be decidable languages over the same alphabet E. Consider language L L1 L2. (L consists of strings that are in L or in L2 but not in both.) Prove that L is...

Question 1 Please! Problem 1: Let L1 and L2 be decidable languages over the same alphabet E. Consider language L L1 L2. (L consists of strings that are in L or in L2 but not in both.) Prove that L is...

Are these statements true or false? Provide proof. (1) Every language in CFL is also in P, and there exists a language Le P such that L is not in CFL. (2) Let L1 and L2 be two languages such that L...

6. Let L1 and L2 be two languages. (a) Define the exclusive-or (XOR) operation as L1La = {xl either x L1 or x L2 but not both) Prove or disprove that Turing-recognizable languages are closed under...

6. Let L1 and L2 be two languages. (a) Define the exclusive-or (XOR) operation as L12 = {xl either x E L1 or x L2 but not both} operation. Prove or disprove that Turing-recognizable languages are...

6. Let L1 and L2 be two languages. (a) Define the exclusive-or (XOR) operation as Le La = {rl either r E Li orr e L2 but not both) Prove or disprove that Turing-recognizable languages are closed...

6. Let L1 and L2 be two languages. (a) Define the exclusive-or (XOR) operation as Li2 = {xl either z E L1 or x La but not both} Prove or disprove that Turing-recognizable languages are closed under...

Let be a finite alphabet and let L1 and L2 be two languages over . Assume you have access to two routines IsStringinL1(u) and IsStringInL2(u). The former routine decides whether a given string u is...

Let be a nite alphabet and let L1 and L2 be two languages over . Assume you have access to two routines IsStringInL1(u) and IsStringInL2(u). The former routine decides whether a given string u is in...

Consider the Venn Diagram below. Each number represents the cardinality of the region. A B 7 n(A) = n(B)= n(An B)= n(AUB)= n(A)= n(B)= 6 2 3 U

According to a Pew Research Center nationwide telephone survey of American adults conducted by phone between March 15 and April 24, 2011, 75% of adults said that college education has become too...

Question 8 Suppose Westerfield Co . has the following financial information: Debt: 9 0 0 , 0 0 0 bonds outstanding with a face value of \ ( \ $ 1 , 0 0 0 \ ) . The bonds currently trade at \ ( 8 5 \...

Compared with half a century ago, adoption has become _ _ _ _ _ _ _ _ _ common, but it is more open and acceptabl e , so we probably discuss it _ _ _ _ _ _ _ . fill in the blanks more or much less or...

In the Data Source View in Visual Studio, what option is available to view data in any Source View Table? What are the primary uses this capability?

What Microsoft Analysis Services Extension for Visual Studio 2017 needs to be installed before beginning work on a Multidimensional OLAP Cube Project? How can the installation be verified?

Why would the FedScope Employment database be more representative of the General Population in terms of Salary Data than the CPS studies?