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Classification of numbers ( dicopy dari Wikipedia, the free encyclopedia )
See also: List of types of numbers
Different 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, ... | |
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Integers | ..., −5, −4, −3, −2, −1, 0, 1, 2, 3, 4, 5, ... | |
- | Positive integers | 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 |
[edit] Natural numbers
Main article: Natural number
The most familiar numbers are the natural numbers or counting numbers: one, two, three, and so on
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