Classification of Numbers
See also: List of types of numbersDifferent types of numbers are used in many cases. Numbers can be classified into sets, called number systems. (For different methods of expressing numbers with symbols, such as the Roman numerals, see numeral systems.)
| Natural | 0, 1, 2, 3, 4, ... or 1, 2, 3, 4, ... | |
|---|---|---|
| Integers | ..., −5, −4, −3, −2, −1, 0, 1, 2, 3, 4, 5, ... | |
| Rational | a⁄b where a and b are integers and b is not zero | |
| Real | The limit of a convergent sequence of rational numbers | |
| Complex | a + bi where a and b are real numbers and i is the square root of −1 |
Read more about this topic: Number
Famous quotes containing the word numbers:
“I’m not even thinking straight any more. Numbers buzz in my head like wasps.”
—Kurt Neumann (1906–1958)