Problem 3. Provide short answers to the following questions: a. Write an example of a valid argument. b. Write an example of a sound argument. c. What is the advantage of a sound argument compared with a valid argument? d. Using the truth table for implication, show when an argument is valid but not sound.

Problem 3. Provide short answers to the following questions: a. Write an example of a valid argument. b. Write an example of a sound argument. c. What is the advantage of a sound argument compared with a valid argument? d. Using the truth table for implication, show when an argument is valid but not sound.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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5. We are given the statement "C3PO is a droid and Han is not a droid". (a) Using the following statement variables, write the corresponding statement form: Let p = "C3PO is a droid" and q = "Han is a droid" (b) Using De Morgan's Laws, develop the negation of the statement form of part (a) (c) What is the statement that corresponds to the statement form of part (b)?
Complete the missing values
sketch the diagram for an argument a) involving the word ‘All’: b) involving the word ‘Some’: C) involving the word ‘None’:
3. Use De Morgan's Laws to write negations for the following statement: The train is late or my watch is fast.
Explain why the following argument is invalid using a counter-example.Explain how it proves its invalidity.1. Candy gives you cavities2. Anything you stick in the freezer isn’t candy3. Nothing in the freezer gives you cavities
(2) Let P (x, y) : x plays in y." A(x) : x is athletic." S(x) :x is smart." E(y) : y is in English league." F (y) : y is famous." Assume the domain of x is all players and the domain of y is all football teams. Answer the following questions. (a) Write the symbolic for: Some smart and athletic players play in some English league teams (b) Write the English for: 3y A(MohamedSalah) ^ E(y) ^ P (MohamedSalah, y). (c) Rewrite the statement starting with "Some... ": Not all smart players play in some famous teams
For the following Boolean functions, give a tabular representation of their Boolean expressions: b) (i) F(x,y, 2) = [X ·y] z 3/7 - (ii) F(x, y, z) = [x ·z] ly z] (iii) What can you say about (i) and (ii) above?
Part A:Which of the following is a quantified statement? A. The Mississippi River is the longest river in the world. B. Are we there yet? C. Some dogs do not go to heaven. D.Go, Eagles! E.Go, Bears! Part B: Which of the following is a quantified statement? a. Some planets are habitable. b. Disney World is in Alabama. c. Wild animals need to be protected. d. My car is green. e. The pyramids in Egypt were built by aliens.
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Objective: Practice writing recursive functions in python3 Make the five recursive functions described below in python3 by using the starter code recursive_functions.py. For each function, figure out how to solve it conceptually : write down the base case (when recursion stops) and how each recursive function-call moves towards the base case. The functions should not print anything (except you may add temporary print statements to help debug them). You can test your program by using the provided program test_recursive_functions.py. Don't edit the test program. Put it into the same directory (folder) with your recursive_functions.py and run it. It will import your functions as a module, test your functions, and tell you when each function is returning correct results. 1. Factorial In math, if you have a number n, the factorial function (written n!) computes n x (n-1) x (n-2) x (n-3) x ... x 1. For example: 0! is defined to be 1 1! = 1 2! = 2 x 1=2 3! = 3 x 2 x 1=6 4! = 4 x 3…