Exploring Integers: The Core of Mathematics

Study Notes

Exploring Integers: The Core of Mathematics

In the vast, intricate world of mathematics, integers stand out as a fundamental building block of numbers. They are whole numbers that include both positive and negative quantities, excluding fractions and decimals. This article will explore the concept of integers, their properties, and how they contribute to the rich tapestry of mathematics.

Definition and Examples

An integer is a number that can be expressed as the result of subtracting one integer from another, i.e., integers are the set of numbers {..., -3, -2, -1, 0, 1, 2, 3, ...}.

Some examples of integers include:

0
1, -1
2, -2
3, -3
4, -4

Properties

Integers have a few notable properties:

Closure under addition and subtraction: When you add or subtract integers together, you will always obtain another integer as the result. For instance, 2 + 3 = 5 and 1 - (-4) = 5.
Positive and negative integers: For every positive integer, there exists a corresponding negative integer that has the same absolute value. For example, the negative of 5 is -5.
Addition's property of commutativity: Integers follow the commutative property of addition, which means that the order of adding integers does not matter: a + b = b + a.
Subtraction's property of commutativity: Also, the order of subtracting integers does not matter, so a - b = b - a. However, this rule does not hold for negative numbers when considering the absolute values.
Integers are closed under multiplication: When you multiply integers together, you will obtain an integer as the result. For example, 2 * 3 = 6.
Ordering of integers: Integers can be ordered from least to greatest, and this ordering is consistent with the standard ordering of positive integers, followed by 0, and then negative integers.

Applications

Integers are widely used in mathematics as building blocks for many other concepts, such as fractions, decimals, polynomials, algebraic expressions, and other advanced mathematical concepts. In daily life, integers are used in:

Money transactions (e.g., 100 dollars, -25 cents)
Measurements (e.g., -5 degrees Celsius)
Scores in games and competitions

With a solid understanding of integers, you will be well-equipped to explore and understand more complex mathematical concepts.

Description

Explore the fundamental concept of integers, their properties, and their applications in mathematics and daily life. Learn about the definition of integers, their properties, and how they serve as building blocks for various mathematical concepts.