<span class="intersentencespace"></span> For example, <span class="inline_math">\( \pi = 3.141592653589793\ldots \)</span> where the dots indicate
that the decimal expansion of <span class="inline_math">\( \pi \)</span> continues all the way to infinity.</p>
<p>Combining the irrational numbers with the rationals gives us all the useful numbers,
which we call the set of real numbers <span class="inline_math">\( \mathbb{R} \)</span>.<span class="intersentencespace"></span> The set <span class="inline_math">\(