A couple of fixes to index

ch-der.tex

@@ -518,7 +518,7 @@ \subsection{Relative minima and maxima}
 \begin{defn}
 Let $S \subset \R$ be a set and
 let $f \colon S \to \R$ be a function.  The function $f$ is said to have
-a \emph{\myindex{relative maximum}}\index{minimum!relative}
+a \emph{\myindex{relative maximum}}\index{maximum!relative}
 at $c \in S$ if there exists a $\delta>0$
 such that for all $x \in S$ where $\abs{x-c} < \delta$
 we have $f(x) \leq f(c)$.
@@ -1353,7 +1353,7 @@ \subsection{Taylor's theorem}
 of $f$ at $c$,
 we mean that there exists a $\delta > 0$ such that $f(x) > f(c)$ for
 all $x \in (c-\delta,c+\delta)$ where $x\not=c$.
-A \emph{\myindex{strict relative maximum}}\index{minimum!strict relative}
+A \emph{\myindex{strict relative maximum}}\index{maximum!strict relative}
 is defined similarly.
 Continuity of the second derivative is not needed, but the proof is more
 difficult and is left as an exercise.  The proof also generalizes

ch-riemann.tex

@@ -119,9 +119,9 @@ \subsection{Partitions and lower and upper integrals}
 \inf \, \bigl\{ U(P,f) : P \text{ a partition of $[a,b]$} \bigr\} .
 \end{align*}
 We call $\underline{\int}$\glsadd{not:lowerdarboux}
-the \emph{\myindex{lower Darboux integral}}\index{Darboux integral!lower} and
+the \emph{\myindex{lower Darboux integral}} and
 $\overline{\int}$\glsadd{not:upperdarboux} the
-\emph{\myindex{upper Darboux integral}}\index{Darboux integral!upper}.
+\emph{\myindex{upper Darboux integral}}\index{Darboux integral}.
 To avoid worrying about the variable of integration, 
 we often simply write
 \begin{equation*}