A useless state in a pushdown automaton is never entered on any input string. Consider the problem

Question:

A useless state in a pushdown automaton is never entered on any input string. Consider the problem of determining whether a pushdown automaton has any useless states. Formulate this problem as a language and show that it is decidable.

Fantastic news! We've Found the answer you've been seeking!

Step by Step Answer:

Related Book For book-img-for-question

Introduction to the theory of computation

ISBN: 978-0470530658

3rd edition

Authors: Michael Sipser

See More Books

Question Posted: Sep 02, 2020 04:44 AM

See More Questions

A useless state in a Turing machine is one that is never entered on any input string. Consider the problem of determining whether a Turing machine has any useless states. Formulate this problem as a...
Consider the problem of determining whether a DFA and a regular expression are equivalent. Express this problem as a language and show that it is decidable.
Consider the problem of determining whether a two-tape Turing machine ever writes a nonblank symbol on its second tape when it is run on input w. Formulate this problem as a language and show that it...
Why do most cities in the United States now have more radios but fewer radio repair shops than they did in 1960?
The situation in Exercise 5. Suppose that the data in Exercises 5 and 6 are thought to follow a binomial distribution with an unknown parameter. Estimate this parameter and test whether the data fit...
Discuss your views on financial statements and their usefulness in managing a division or a business. Include in your discussion: What else would you like to see in the financial statements? What...
What is products liability? Describe what legal theories an injured party can pursue when filing a lawsuit against a seller, manufacturer, or supplier of goods. Describe the defenses often used in...
Goodeating Dog Chow Company produces a variety of brands of dog chow. One of their best values is the 50-pound bag of Goodeating Dog Chow. George Hamilton, president of Goodeating, uses a very old...
10. A nickel (m = 5.00 g) is placed on the edge of a rotating disc with a radius of 0.41 m. At a particular instant, the component of the force acting on the coin causing it to have an acceleration...
Design a 4-bit, 8-function arithmetic unit that will meet the following specifications: S2 0 0 0 0 1 1 1 1 S1 0 0 1 1 0 0 1 1 SO 0 1 0 1 0 1 0 1 F 2A A plus B A plus B A minus 1 2A plus 1 A plus B...
Say that an NFA is ambiguous if it accepts some string along two different computation branches. Let AMBIG NFA = {N| N is an ambiguous NFA}. Show that AMBIGNFA is decidable. One elegant way to solve...
Let BAL DFA = {M| M is a DFA that accepts some string containing an equal number of 0s and 1s}. Show that BALDFA is decidable. Theorems about CFLs are helpful here.
According to observer A, two objects of equal mass and moving along the x axis collide head on and stick to each other. Before the collision, this observer measures that object 1 move to the right...
If a car is approaching you at night with headlights \(1 \mathrm{~m}\) apart, how far away must you be in order to just resolve them? (Treat the headlights as single slits of width \(1 \mathrm{~mm}\)...
EZjET, a small regional airline, wishes to predict sales for its business travelers between two cities for 2017. It has recorded data for its past 14 years demand and has obtained information on the...
Consider an economy with two traded assets with returns \(\tilde{r}_{1}\) and \(\tilde{r}_{2}\) together with a market portfolio with return \(\tilde{r}^{m}\). The covariance matrix of the random...
Write the method of passing data between two JSP pages.
Before interviewing for a job, you should learn all you can about the company to help prepare you to ask meaningful questions during the interview. To find out more about a company, you can conduct...
Using the data from E8-20, indicate the effects on net assets and EPS for the following dates: 1. June 1 (date of declaration) 2. July 15 (date of record) 3. August 14 (date of payment) Data from...
Accounting policies and practices that are most important to the portrayal of the companys financial condition and results, and require managements most difficult, subjective, or complex judgments...
What is the purpose of cladding in an optical fiber?
What is refraction? What is reflection?
What is the function of the twisting in twisted-pair cable?
Scenario: Yarning Circle and Talking Stick Sarah has recently been employed by Blue Bay Early Learning Centre. Sarah is very proud of having just achieved the Diploma of Children's Services and she...
The principal at your school decides to retire, and several well-qualified teachers on the staff apply for the position. Mr. England has been teaching for four years and has his administrator's...
Sandi's parents have been divorced since she was five years old. She is now seven. She lives with her mother and visits her father every other weekend. He brings her to school on Monday mornings...

A useless state in a pushdown automaton is never entered on any input string. Consider the problem

Question:

Step by Step Answer:

Introduction to the theory of computation

Students also viewed these Computer science questions