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91Ó°ÊÓ

10\. Determine whether each of the following is true or false. Here \(p, q\) are arbitrary statements. a) An equivalent way to express the converse of " \(p\) is sufficient for \(q\) " is " \(p\) is necessary for \(q\)." b) An equivalent way to express the inverse of " \(p\) is necessary for \(q\) " is " \(\neg q\) is sufficient for \(\neg p\)." c) An equivalent way to express the contrapositive of \(" p\) is necessary for \(q\) " is " \(\neg q\) is necessary for \(\neg p\)."

Short Answer

Expert verified
Statement a is false, statement b is false, and statement c is true.

Step by step solution

01

Analysis of Statement a

The converse of 'p is sufficient for q' is 'q is sufficient for p'. This is not equivalent to 'p is necessary for q', as the latter can be expressed as 'if q then p'. Therefore, statement a is false.
02

Analysis of Statement b

The inverse of 'p is necessary for q' is 'not p is necessary for not q', which is not equivalent to '\(\neg q\) is sufficient for \(\neg p\)', as the latter can be expressed as 'if \(\neg p\) then \(\neg q\)'. Therefore, statement b is false.
03

Analysis of Statement c

The contrapositive of 'p is necessary for q' is 'not q is necessary for not p', which is equivalent to '\(\neg q\) is necessary for \(\neg p\)', as both can be expressed as 'if \(\neg p\), then \(\neg q\)'. Therefore, statement c is true.

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Key Concepts

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

Converse Statement
When studying logical statements, it's important to understand their relationships and transformations. A converse statement is formed by reversing the hypothesis and conclusion of a conditional statement. If the original statement is 'If p, then q' (denoted as \( p \rightarrow q \)), the converse statement would be 'If q, then p' (or \( q \rightarrow p \)).

The key point to remember is that the truth value of the converse is not necessarily the same as the original statement. This means that even if the statement 'If it rains, then the ground is wet' is true, the converse 'If the ground is wet, then it rains' may not be true since there could be other reasons for the wet ground.

To improve understanding:
  • Consider practicing with real-life examples to see how the converse may not always be true.
  • Compare the original statement and its converse side by side to clearly see the structure change.
  • Understand that the converse of a true statement needs to be verified independently.
Inverse Statement
An inverse statement is derived from a conditional statement by negating both the hypothesis and the conclusion. If our original conditional statement is 'If p, then q', then the inverse would be 'If not p, then not q', denoted as \( eg p \rightarrow eg q \).

Similar to the converse, the inverse does not necessarily share the same truth value as the original statement. For example, if we know 'If a figure is a square, then it has four sides' is true, the inverse would be 'If a figure is not a square, then it does not have four sides' which is clearly not true, since rectangles also have four sides.

Here's how to clarify understanding:
  • Discuss the difference between the inverse and the original statement's truth values.
  • Analyze the implications of negating both the hypothesis and conclusion.
  • Use varied examples to see how inverses perform in different logical scenarios.
Contrapositive Statement
The contrapositive of a conditional statement switches the hypothesis and conclusion of the inverse statement. Given 'If p, then q', the contrapositive is 'If not q, then not p', symbolically represented as \( eg q \rightarrow eg p \).

Unlike the converse and inverse, the contrapositive of a true statement is always true. This is a crucial aspect of logical equivalence. For instance, if the statement 'If an animal is a dog, then it is a mammal' is true, so is the contrapositive 'If an animal is not a mammal, then it is not a dog'.

To enhance comprehension, consider the following:
  • Explore the logic behind why the contrapositive always shares the same truth value as the original statement.
  • Practice creating contrapositives for a variety of conditional statements.
  • Apply the concept of contrapositive to prove statements in mathematics and logic.

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Most popular questions from this chapter

4\. For primitive statements \(p, q, r\), and \(s\), simplify the compound statement $$ [[[(p \wedge q) \wedge r] \vee[(p \wedge q) \wedge \neg r]] \vee \neg q] \rightarrow s $$

18\. Negate and simplify each of the following. a) \(\exists x[p(x) \vee q(x)]\) b) \(\forall x[p(x) \wedge \neg q(x)]\) c) \(\forall x[p(x) \rightarrow q(x)]\) d) \(\exists x[(p(x) \vee q(x)) \rightarrow r(x)]\)

25\. Let the universe for the variables in the following statements consist of all real numbers. In each case negate and simplify the given statement. a) \(\forall x \forall y[(x>y) \rightarrow(x-y>0)]\) b) \(\forall x \forall y[(x

21\. Prove that for all real numbers \(x\) and \(y\), if \(x+y \geq 100\), then \(x \geq 50\) or \(y \geq 50\)

17\. After baking a pie for the two nieces and two nephews who are visiting her, Aunt Nellie leaves the pie on her kitchen table to cool. Then she drives to the mall to close her boutique for the day. Upon her return she finds that someone has eaten. one-quarter of the pie. Since no one was in her house that day \(-\) except for the four visitors - Aunt Nellie questions each niece and nephew about who ate the piece of pie. The four "suspects" tell her the following: Charles: Kelly ate the piece of pie. Dawn: I did not eat the piece of pie. Kelly: Tyler ate the pic. Tyler: Kelly lied when she said I ate the pie. If only one of these four statements is true and only one of the four committed this heinous crime, who is the vile culprit that Aunt Nellie will have to punish severely?

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