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Integer - Wikipedia, the free encyclopedia |
 | | Like the natural numbers, Z is closed under the operations of addition and multiplication, that is, the sum and product of any two integers is an integer. |
 | | All the properties from the above table, except for the last, taken together say that Z together with addition and multiplication is a commutative ring with unity. |
 | | The lack of multiplicative inverses, which is equivalent to the fact that Z is not closed under division, means that Z is not a field. |
| en.wikipedia.org /wiki/Integer (958 words) |
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