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<p>numbers, mathematicians such as <a href="page.php?w=Diophantus">Diophantus</a> considered negative solutions to problems "false" and equations requiring negative solutions were described as absurd. Western mathematicians like <a href="page.php?w=Gottfried_Wilhelm_Leibniz">Leibniz</a> held that negative numbers were invalid, but still used them in calculations.</p>

<p><big>Introduction</big></p>
<p><big>The number line</big></p>
<p>The relationship between negative numbers, positive numbers, and zero is often expressed in the form of a <b>number line</b>:Numbers</p><p>
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