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<p>an unspecified constant of the theory, or is being <a href="page.php?w=Quantifier_%28logic%29">quantified</a> over.</p>

<p><big> History </big></p>
<p><big> Early history </big></p>
<p>The earliest uses of an "unknown quantity" date back to at least the <a href="page.php?w=Ancient_Egyptian_mathematics">Ancient Egyptians</a> with the <a href="page.php?w=Moscow_Mathematical_Papyrus">Moscow Mathematical Papyrus</a> (c. 1500 BC) which described problems with unknowns rhetorically, called the "Aha problems". The "Aha problems" involve finding unknown quantities (referred</p><p>
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