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Chapter 2: Problem 3

Rewrite each set using the listing method. The set of months with exactly 31 days.

Short Answer

Expert verified
The set of months with exactly 31 days can be rewritten using the listing method as: \[\{January, March, May, July, August, October, December\}\]

Step by step solution

01

Identify the months with 31 days

First, we need to know which months have exactly 31 days. They are January, March, May, July, August, October, and December.
02

Write the set using listing method

Now that we have identified the months with 31 days, we can write this set using the listing method by putting these months between curly brackets and separating them with commas. The set of months with exactly 31 days is: \[\{January, March, May, July, August, October, December\}\]

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Key Concepts

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

Listing Method
The listing method, also known as the roster method, is a straightforward way to represent a set by writing out all its elements inside curly brackets. Each member is separated by a comma, making it clear and organized.
In this format, a set is simply a collection of distinct elements or objects. The key is that the order doesn't matter, and no element is repeated. For example, if you have a set \\( \{1, 2, 3\} \), it's the same as \( \{3, 2, 1\} \). What matters is the elements listed.
  • Start with an open curly bracket \( \{ \).
  • List all the elements separated by commas.
  • End with a close curly bracket \( \} \).
This method is especially handy for sets with a small number of elements, like days of the week or specific months of the year, as demonstrated in the example.
Months of the Year
The months of the year are a familiar concept, but it's helpful to know specific details such as the number of days in each month. This can be essential when working with problems involving dates.
There are twelve months in a year, each serving a distinct role in our calendar system. Out of these, several months have 31 days:
  • January
  • March
  • May
  • July
  • August
  • October
  • December
Knowing which months have 31 days can help in organizing tasks, planning events, or solving mathematical problems related to time and dates.
Discrete Mathematics
Discrete mathematics focuses on distinct and separate values or structures, unlike continuous mathematics, which deals with concepts that are smoothly connected.
This field includes areas such as set theory, graph theory, and combinatorics. It is fundamental to computer science and logic, dealing with countable structures.
In discrete mathematics, understanding sets is essential. Sets, like the one mentioned in the exercise for months with 31 days, are basic structures to study collections of objects.
  • Sets can be finite or infinite.
  • They form the foundation for many types of discrete structures.
  • Discrete mathematics is crucial for algorithms and data structures.
Mastering set theory concepts like the listing method can greatly enhance problem-solving skills in this area.

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Most popular questions from this chapter

In Exercises \(41-46,\) a language \(L\) over \(\Sigma=\\{a, b\\}\) is given. Find five words in each language. \(L=\left|x \in \Sigma^{*}\right| x\) begins with and ends in \(b .1\)

Every nonempty set has at least two subsets.

Mark each as true or false. $$ \emptyset \subseteq \emptyset $$

The sum of two fuzzy sets \(A\) and \(B\) is the fuzzy set \(A \oplus B,\) where \(d_{A \oplus B}(x)=\) 1\(\wedge\left|d_{A}(x)+d_{B}(x)\right|\) itheir difference is the fuzzy set \(A-B,\) where \(d_{A-B}(x)=\) \(0 \vee\left[d_{A}(x)-d_{B}(x)\right] ;\) and their eartesian produet is the fuzzy set \(A \times B\) where \(d_{A \times B}(x, y)=d_{A}(x) \wedge d_{B}(x) .\) Use the fuzzy sets \(A=\\{\text { Angelo } 0.4, \text { Bart }\) \(0.7,\) Cathy 0.6\(\\}\) and \(B=\\{\operatorname{Dan} 0.3, \text { Elsie } 0.8, \text { Frank } 0.4\\}\) to find each fuzzy set. $$ A \times B $$

A recent survey by the MAD corporation indicates that of the 700 families interviewed, 220 own a television set but no stereo, 200 own a stereo but no camera, 170 own a camera but no television set, 80 own a television set and a stereo but no camera, 80 own a stereo and a camera but no television set, 70 own a camera and a television set but no stereo, and 50 do not have any of these. Find the number of families with: All of the items.
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