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Find a compound proposition involving the propositional variables \(p, q,\) and \(r\) that is true when \(p\) and \(q\) are true and \(r\) is false, but is false otherwise. [Hint: Use a conjunction of each propositional variable or its negation. \(]\)

Short Answer

Expert verified
p 鈭 q 鈭 卢r

Step by step solution

01

Identify Desired Truth Values

To solve the problem, note that the compound proposition must be true when: p is true, q is true, and r is false. We denote this as: p = T, q = T, r = F.
02

Create Individual Clauses

Construct clauses for each variable so that the proposition aligns with the desired outcomes:p should be true: use the clause p.q should be true: use the clause q.r should be false: use the clause 卢r.
03

Combine Clauses Using Conjunction

To ensure the compound proposition is true only when all the individual clauses are satisfied, combine them with a conjunction (AND):p AND q AND 卢r.
04

Write the Compound Proposition

Combine the individual clauses p, q, and 卢r into a single compound proposition:p 鈭 q 鈭 卢r.
05

Verify the Compound Proposition

Ensure that the compound proposition p 鈭 q 鈭 卢r is true only when p is true, q is true, and r is false, and false for any other combination of p, q, and r.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

compound proposition
A compound proposition is a statement formed by combining one or more simpler propositions using logical connectives. These connectives include AND, OR, and NOT. In our exercise, we combined three propositions: p, q, and 卢r, using the AND connective. The goal was to create a single proposition that is only true when specific conditions are met. For a compound proposition, it is essential to clearly understand the requirements and conditions that must be satisfied. In this case, the conditions were: p is true, q is true, and r is false. By understanding these conditions, we constructed individual clauses for each variable and then combined them using logical connectives to meet the desired outcome.
truth values
In propositional logic, each proposition can have a truth value: true (T) or false (F). The truth values help us evaluate the overall truth of a compound proposition based on its simpler components. In our specific problem, we determined the required truth values as follows:
  • p = T (true)
  • q = T (true)
  • r = F (false)
Using these values, we examined how to construct a proposition that fits precisely these criteria. By identifying the truth values first, we were able to design the compound proposition accordingly. Here鈥檚 how the truth values guided our construction: By asserting that p should be true, we included the clause p. Since q should also be true, we added q. Lastly, because r must be false, we used the negation 卢r. These truth values set the foundation for our final compound proposition.
conjunction
A conjunction is a logical connective that combines two or more propositions and returns true only if all the combined propositions are true. In mathematical notation, a conjunction is represented by the symbol 鈭. In our solution, we used a conjunction to combine the clauses for p, q, and 卢r. This was done as follows:
To ensure the compound proposition is true only when all the individual conditions are met, we wrote: p 鈭 q 鈭 卢r By using the conjunction, we formed a comprehensive statement that is true exclusively when p and q are true, and r is false. If any other combination of truth values is given, the conjunction will yield false. This precise control over truth outcomes is a powerful feature of logical connectives.

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Most popular questions from this chapter

Express each of these statements using quantifiers. Then form the negation of the statement so that no negation is to the left of a quantifier. Next, express the negation in simple English. (Do not simply use the phrase 鈥淚t is not the case that.鈥) a) Every student in this class has taken exactly two mathematics classes at this school. b) Someone has visited every country in the world except Libya. c) No one has climbed every mountain in the Himalayas. d) Every movie actor has either been in a movie with Kevin Bacon or has been in a movie with someone who has been in a movie with Kevin Bacon.

Use resolution to show that the hypotheses 鈥淚t is not raining or Yvette has her umbrella,鈥 鈥淵vette does not have her umbrella or she does not get wet,鈥 and 鈥淚t is raining or Yvette does not get wet鈥 imply that 鈥淵vette does not get wet.鈥

Exercises \(61-64\) are based on questions found in the book Symbolic Logic by Lewis Carroll. Let P(x), Q(x), R(x), and S(x) be the statements 鈥渪 is a baby,鈥 鈥渪 is logical,鈥 鈥渪 is able to manage a crocodile,鈥 and 鈥渪 is despised,鈥 respectively. Suppose that the domain consists of all people. Express each of these statements using quantifiers; logical connectives; and P(x), Q(x), R(x), and S(x). a) Babies are illogical. b) Nobody is despised who can manage a crocodile. c) Illogical persons are despised. d) Babies cannot manage crocodiles. e) Does (d) follow from (a), (b), and (c)? If not, is there a correct conclusion?

Use quantifiers to express the distributive laws of multiplication over addition for real numbers.

Rewrite each of these statements so that negations appear only within predicates (that is, so that no negation is outside a quantifier or an expression involving logical connectives). a) \(\neg \forall x \forall y P(x, y) \quad\) b) \(\neg \forall y \exists x P(x, y)\) c) \(\neg \forall y \forall x(P(x, y) \vee Q(x, y))\) d) \(\neg(\exists x \exists y \neg P(x, y) \wedge \forall x \forall y Q(x, y))\) e) \(\quad \neg \forall x(\exists y \forall z P(x, y, z) \wedge \exists z \forall y P(x, y, z))\)

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