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<p>part and the imaginary part of the complex number. Imaginary numbers are often called purely imaginary to distinguish them from complex numbers more generally; the set of all imaginary numbers is sometimes denoted , where  denotes the set of real numbers.</p>

<p><big>History</big></p>
<p>Although the Greek <a href="page.php?w=mathematician">mathematician</a> and <a href="page.php?w=engineer">engineer</a> <a href="page.php?w=Heron_of_Alexandria">Heron of Alexandria</a> is noted as the first to present a calculation involving the square root of a negative</p><p>
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