 time on this topic in future courses. In first-semester calculus,
  you learned how to compute limits of functions. Here's the formal
  epsilon-delta definition of a limit.</p>

  <div class="definition">
    Let $f:\RR\to\RR$ be a function. We write $\ds \lim_{x\to c}
    f(x)=L$ if and only if for every $\epsilon&gt;0$, there exists
    a $\delta&gt;0$ such that $0&lt;|x-c|&lt;\delta$ implies
    $|f(x)-L|&lt;\epsilon$.
  </div>
                
  <p>We're looking at this formal definition here because w