Real numbers
Real numbers are all the numbers that can be found on a number line. This includes both rational and irrational numbers.
The opposite of a real number is a complex number (which includes the
imaginary unit
More simply, a real number is any number with only a real part (no imaginary part, so no coefficient of
).
Notation
Section titled “Notation”The set of real numbers is usually denoted by the symbol
Contained values
Section titled “Contained values”Examples of real numbers
Section titled “Examples of real numbers”(simplifies to , which is real)
Non-examples of real numbers
Section titled “Non-examples of real numbers”(imaginary constant) (complex number with real and imaginary parts) (pure imaginary number) (complex number with real and imaginary parts)