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Translate these statements into English, where \(R(x)\) is "x is a rabbit" and \(H(x)\) is " \(x\) hops" and the domain consists of all animals. $$ \begin{array}{ll}{\text { a) } \forall x(R(x) \rightarrow H(x))} & {\text { b) } \forall x(R(x) \wedge H(x))} \\ {\text { c) } \quad \exists x(R(x) \rightarrow H(x))} & {\text { d) } \exists x(R(x) \wedge H(x))}\end{array} $$

Short Answer

Expert verified
a) If it is a rabbit, then it hops. b) Every animal is a rabbit and it hops. c) There exists a rabbit that hops. d) There exists a rabbit that hops.

Step by step solution

01

Translating statement (a)

The statement \(\forall x(R(x) \rightarrow H(x))\) means 'For all animals \ x\, if \ x\ is a rabbit, then \ x\ hops.'
02

Translating statement (b)

The statement \(\forall x(R(x) \wedge H(x))\) means 'For all animals \ x\, \ x\ is a rabbit and \ x\ hops.'
03

Translating statement (c)

The statement \(\forall x(R(x) \rightarrow H(x))\) means 'There exists an animal \ x\ such that if \ x\ is a rabbit, then \ x\ hops.'
04

Translating statement (d)

The statement \(\forall x(R(x) \wedge H(x))\) means 'There exists an animal \ x\ such that \ x\ is a rabbit and \ x\ hops.'

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Key Concepts

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

Quantifiers
In predicate logic, quantifiers play a crucial role in defining the extent of the truth of a predicate across a domain. The two most common quantifiers are the universal quantifier \(\forall\), which means 'for all,' and the existential quantifier \(\exists\), which means 'there exists.' These quantifiers help specify whether a predicate applies to all elements in a domain or at least one element.

For example, the statement \(\forall x(R(x) \rightarrow H(x))\) can be read as 'For all animals \ x\, if \ x\ is a rabbit, then \ x\ hops.' Here, the universal quantifier \(\forall\) indicates that the implication must hold true for every animal in the domain.
Similarly, the existential quantifier \(\exists\) in the statement \(\exists x(R(x) \rightarrow H(x))\) indicates that there is at least one animal for which the implication holds true. In simpler terms, it means 'There exists an animal \ x\ such that if \ x\ is a rabbit, then \ x\ hops.'

The correct understanding of these quantifiers is essential for accurately interpreting and translating logical statements. They help to clearly convey whether the properties or conditions specified by the predicates apply to all members of the domain or just some of them.
Logical Statements
Logical statements are expressions that can be either true or false. In predicate logic, these statements frequently involve variables and predicates, combined with logical connectives and quantifiers, to form more complex expressions.

Some common logical connectives include:
  • \(\rightarrow\) (implies)
  • \(\wedge\) (and)
  • \(\vee\) (or)
  • \(eg\) (not)
By mastering these, one can form nuanced logical statements useful for various applications in mathematics, computer science, and philosophy.

For example, the statement \(\forall x(R(x) \wedge H(x))\) combines the predicates \(R(x)\) and \(H(x)\) using the logical 'and' connective \(\wedge\). This statement translates to 'For all animals \ x\, \ x\ is a rabbit and \ x\ hops.'
The logical structure of such statements helps in methodically breaking down and understanding complex scenarios. For instance, knowing the truth value of the statement: \(R(x) \rightarrow H(x)\) can help us determine the necessary condition for a rabbit to hop.
Translation of Predicates
Translating predicates from symbolic logic to natural language involves converting logical expressions into comprehensible sentences. This process helps in better understanding and communication of logical relationships.

To translate predicates effectively:
  • Identify the quantifiers
  • Note the logical connectives
  • Understand the domain of discourse
With these elements in mind, we can translate complex logical statements into plain English.

For instance, the expression \(\forall x(R(x) \rightarrow H(x))\) means 'For all animals \ x\, if \ x\ is a rabbit, then \ x\ hops.' The universal quantifier \(\forall\) indicates that this relationship must hold for every animal in the domain.
Another example is the statement \(\exists x(R(x) \wedge H(x))\), which translates to 'There exists an animal \ x\ such that \ x\ is a rabbit and \ x\ hops.' Here, the existential quantifier guarantees that at least one such animal exists.
Translating logical statements to natural language can make learning and discussing logical concepts more intuitive and accessible.

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Most popular questions from this chapter

Express the negations of these propositions using quantifiers, and in English. a) Every student in this class likes mathematics. b) There is a student in this class who has never seen a computer. c) There is a student in this class who has taken every mathematics course offered at this school. d) There is a student in this class who has been in at least one room of every building on campus.

Find all squares, if they exist, on an \(8 \times 8\) checkerboard such that the board obtained by removing one of these squares can be tiled using straight triominoes. [Hint: First use arguments based on coloring and rotations to eliminate as many squares as possible from consideration. \(]\)

Prove that there are infinitely many solutions in positive integers \(x, y,\) and \(z\) to the equation \(x^{2}+y^{2}=\) \(z^{2} .\left[\text { Hint: Let } x=m^{2}-n^{2}, y=2 m n, \text { and } z=m^{2}+n^{2}\right.\) where \(m\) and \(n\) are integers. \(]\)

Let M(x, y) be 鈥渪 has sent y an e-mail message鈥 and T(x, y) be 鈥渪 has telephoned y,鈥 where the domain consists of all students in your class. Use quantifiers to express each of these statements. (Assume that all e-mail messages that were sent are received, which is not the way things often work.) a) Chou has never sent an e-mail message to Koko. b) Arlene has never sent an e-mail message to or tele- phoned Sarah. c) Jose has never received an e-mail message from Deborah. d) Every student in your class has sent an e-mail mes- sage to Ken. e) No one in your class has telephoned Nina. f ) Everyone in your class has either telephoned Avi or sent him an e-mail message. g) There is a student in your class who has sent every- one else in your class an e-mail message. h) There is someone in your class who has either sent an e-mail message or telephoned everyone else in your class. i) There are two different students in your class who have sent each other e-mail messages. j) There is a student who has sent himself or herself an e-mail message. k) There is a student in your class who has not received an e-mail message from anyone else in the class and who has not been called by any other student in the class. l) Every student in the class has either received an email message or received a telephone call from another student in the class. m) There are at least two students in your class such that one student has sent the other e-mail and the second student has telephoned the first student. n) There are two different students in your class who between them have sent an e-mail message to or telephoned everyone else in the class.

Find a counterexample, if possible, to these universally quantified statements, where the domain for all variables consists of all real numbers. $$ \begin{array}{ll}{\text { a) } \forall x\left(x^{2} \neq x\right)} & {\text { b) } \forall x\left(x^{2} \neq 2\right)} \\ {\text { c) } \forall x(|x|>0)} \end{array} $$

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