Setting Examples

Abstract

When we are interested in studying several objects at the same time, we may put these objects into a set. Some of the most commonly used sets in mathematics are the following sets of numbers.

• $\mathbb {N}$ is the set of natural numbers (positive integers);

• $\mathbb {Z}$ is the set of integers (natural numbers, their negatives, and zero);

• $\mathbb {Q}$ is the set of rational numbers (positive and negative fractions and zero);

• $\mathbb {R}$ is the set of real numbers (finite and infinite decimals); and

• $\mathbb {C}$ is the set of complex numbers (real numbers, imaginary numbers, and their sums).