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, ... | |
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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 |
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Famous quotes containing the word numbers:
“The principle of majority rule is the mildest form in which the force of numbers can be exercised. It is a pacific substitute for civil war in which the opposing armies are counted and the victory is awarded to the larger before any blood is shed. Except in the sacred tests of democracy and in the incantations of the orators, we hardly take the trouble to pretend that the rule of the majority is not at bottom a rule of force.”
—Walter Lippmann (18891974)
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