The Real Number System
The Real Number System
We use the following definitions:
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\(\mathbb{N}\): natural numbers are \(\{1; 2; 3; \ldots\}\)
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\(\mathbb{N}_0\): whole numbers are \(\{0; 1; 2; 3; \ldots\}\)
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\(\mathbb{Z}\): integers are \(\{\ldots; -3; -2; -1; 0; 1; 2; 3; \ldots\}\)
The following video shows an example of determining which of the above sets of numbers a particular number is in.
Fact:
Not all numbers are real numbers. The square root of a negative number is called a non-real or imaginary number. For example \(\sqrt{-1}\), \(\sqrt{-28}\) and \(\sqrt{-5}\) are all non-real numbers.
This lesson is part of:
Algebraic Expressions Overview
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