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<p>Certain non-zero integers map to <a href="page.php?w=additive_identity">zero</a> in certain rings.</p>

<p>The lack of <a href="page.php?w=zero_divisor">zero divisor</a>s in the integers (last property in the table) means that the commutative ring&nbsp; is an <a href="page.php?w=integral_domain">integral domain</a>.</p>

<p>The lack of multiplicative inverses, which is equivalent to the fact that  is not closed under division, means that  is not a <a href="page.php?w=field_%28mathematics%29">field</a>. The smallest field containing the integers</p><p>
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