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+% Sample file: mathB.tex
+% Typeset with LaTeX format
+\documentclass{article}
+
+\begin{document}
+In first year Calculus, we define intervals such as
+%$(u, v)$ and $(u, \infty)$. Such an interval is a
+ $(u, v)$ and (u, \infty)$. Such an interval is a
+ {\emph{neighborhood} of $a$
+if $a$ is in the interval. Students should
+realize that $\infty$ is only a
+symbol, not a number. This is important since
+we soon introduce concepts
+ such as $\lim_{x \to \infty} f(x)$.
+%such as $\lim_{x \to \infty f(x)$.
+
+When we introduce the derivative
+\[
+ \lim_{x \to a} \frac{f(x) - f(a)}{x - a}
+ %\lim_{x \to a} \frac{f(x) - f(a) x - a}
+\]
+we assume that the function is defined and continuous
+in a neighborhood of $a$.
+\end{document}