Four
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Scan day: 17 February 2014 UTC
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Description: Description of the number four.
is a number, a word or symbol used to designate quantities or, by extension, entities having quantitylike properties. The simplest numbers are the natural numbers, , ..., used in counting; they are also called the whole numbers, positive integers, or positive rational integers. The natural numbers are closed with respect to addition and multiplication; that is, the sum and product of two natural numbers are always natural numbers. Because the quotient of two natural numbers, however, is not always a natural number, it is convenient to introduce the positive fractions to represent the quotient of any two natural numbers. The natural number
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| Page title: | Four |
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