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      <text>10.1.1.4 What is a Complex Number?</text>
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      <text><![CDATA[<div class="HELM_keypoint">
<h4>Key Point </h4>
<p><span class="math display">\[\text{If}\qquad z=a+i b\qquad\text{then}\qquad 
\text{Re}(z)=a\quad \text{and}\quad \text{Im}(z)=b\]</span> Both the real and imaginary parts of a complex number are <span><strong>real</strong></span>.</p>
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