Fix two errata in exercises

ca.tex

@@ -7004,7 +7004,7 @@ \subsection{Schwarz's lemma}
 Prove a certain generalization of Schwarz's lemma
 called the \emph{\myindex{Cartan's uniqueness theorem}}:
 Suppose $U \subset \C$
-is bounded,
+is a bounded domain,
 $f \colon U \to U$ is holomorphic,
 $p \in U$,
 and $f(p)=p$.
@@ -7142,7 +7142,7 @@ \subsection{Automorphisms of the disc}
 f(z) = \frac{a z +b}{c z + d}
 \avoidbreak
 \end{equation*}
-for real numbers $a,b,c,d$ such that $ad-bc \not= 0$.
+for real numbers $a,b,c,d$ such that $ad-bc > 0$.
 \end{exercise}
 
 \begin{exercise}

changes-draft.html

@@ -18,6 +18,8 @@
   Seems more straightforward stated this way.
 <li>Note that Exercise 3.5.3 is called the Cartan's uniqueness theorem
   and add it to the index.
+<li>In exercise 3.5.7, ask for the condition \(ad-bc &gt; 0\) rather than
+  just \(ad-bc \not= 0 ,\) as while "correct" it is misleading.
 <li>In proof of Corollary 5.2.3, emphasize where proof of first item ends and
   the proof of the converse statement starts.
 <li>In the comments after Definition 5.2.4, emphasize that