</p>
<p>The only thing you can’t do with the reals is to take the square root of a negative number—you need the complex numbers <span class="inline_math">\( \mathbb{C} \)</span> for that.<span class="intersentencespace"></span> We defer the discussion on <span class="inline_math">\( \mathbb{C} \)</span> until the end of <a href="03_vectors_fragment.html#chapter-vectors" class="hyperref">Chapter <span class="ref">3</span></a>.</p>
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