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Chapter 1: Problem 133

Give an example of an integer that is not a natural number.

Short Answer

Expert verified
An example of an integer that is not a natural number is -1 or zero.

Step by step solution

01

Definition Overview

First, recognize that natural numbers are positive integers. They normally start from 1 and include numbers like 2, 3, 4, and so on. Zero is not usually considered a natural number. On the other hand, integers can be both negative, positive, and also include zero.
02

Finding an Example

Based on the definitions, it's clear that any negative integer or zero will not be a natural number since natural numbers are defined as positive integers. So, any negative integer, for instance, -1, or zero would serve as an example of an integer that's not a natural number.

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Key Concepts

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

Natural Numbers
Natural numbers are the simplest and most intuitive numbers we usually start learning about as children. They begin at 1, and continue infinitely as 2, 3, 4, and so forth. Often referred to as the "counting numbers", they are used for counting and ordering.
These numbers do not include zero or any negative numbers, and are solely positive integers. Natural numbers are often denoted by the symbol \( \mathbb{N} \). For example:
  • \(1\)
  • \(23\)
  • \(456\)
While they are simplistic, they form the foundation of arithmetic and number theory. Understanding these helps in grasping more complex mathematical ideas.
Negative Integers
Negative integers are the counterparts to positive integers, extending the number line into the left direction. These numbers are less than zero.
They express the idea of having less than nothing and are commonly used in various contexts like temperatures below freezing, owing money, or descending levels. Here are some key points:
  • Negative integers include values like \(-1, -2, -3,\) and so on.
  • They are typically represented on a number line as being on the left of zero.
  • Examples in real-world include temperature readings like \(-5掳C\) or owing $10 pounds (\(-10\) dollars).
Negative integers are critical in solving problems that involve losses or reductions, contrasting with the positive integers.
Zero in Number Systems
Zero holds a special place in the world of numbers. It acts as the separator between the positive integers and negative integers on a number line.
While it does not belong to the set of natural numbers, zero is considered an integer. It's unique because it is neither positive nor negative, and serves as the foundation for our modern decimal system.
Key roles of zero:
  • It functions as an additive identity, meaning any number plus zero equals the original number \((n + 0 = n)\).
  • Zero helps in expressing the absence of value or null quantity.
  • It's crucial for performing operations in algebra, arithmetic, and various fields of mathematics.
Understanding zero is essential, as it allows for the full breadth of arithmetic operations and helps grasp more sophisticated mathematical concepts.

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Most popular questions from this chapter

Explain how to add two numbers with a number line. Provide an example with your explanation.

Use a calculator to find a decimal approximation for each irrational number, correct to three decimal places. Between which two integers should you graph each of these numbers on the number line? $$2-\sqrt{5}$$

Will help you prepare for the material covered in the next section. In each exercise, a subtraction is expressed as addition of an opposite. Find this sum, indicated by a question mark. $$-8-13=-8+(-13)=?$$

Determine whether each statement "makes sense" or "does not make sense" and explain your reasoning. Without adding numbers, I can see that the sum of \(-227\) and 319 is greater than the sum of 227 and \(-319\)

Evaluate both expressions for \(x=4 .\) What do you observe? $$3(x+5) ; 3 x+15$$
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