Fixed xml parse errors.

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/math/trunk@522436 13f79535-47bb-0310-9956-ffa450edef68

xdocs/userguide/estimation.xml

@@ -44,7 +44,9 @@
         <p>
         One important class of estimation problems is weighted least squares problems.
         They basically consist in finding the values for some parameters p<sub>k</sub>
-        such that a cost function J = &sum;(w<sub>i</sub> r<sub>i</sub><sup>2</sup>)
+        such that a cost function J = 
+        <!-- TODO: get entity for summation imported -->
+        sum(w<sub>i</sub> r<sub>i</sub><sup>2</sup>)
         is minimized. The various r<sub>i</sub> terms represent the deviation
         r<sub>i</sub> = mes<sub>i</sub> - mod<sub>i</sub> between the measurements and
         the parameterized models. The w<sub>i</sub> factors are the measurements weights,
@@ -63,6 +65,7 @@
             </li>
             <li>
               they are residuals based instead of generic cost functions based
+            </li>
           </ul>
         </p>
         

xdocs/userguide/ode.xml

@@ -136,7 +136,7 @@
         </p>
         <p>
           <table border="1" align="center">
-          <tr BGCOLOR="#CCCCFF"><td colspan=2><font size="+2">Fixed Step Integrators</font></td></tr>
+          <tr BGCOLOR="#CCCCFF"><td colspan="2"><font size="+2">Fixed Step Integrators</font></td></tr>
           <tr BGCOLOR="#EEEEFF"><font size="+1"><td>Name</td><td>Order</td></font></tr>
           <tr><td><a href="../apidocs/org/apache/commons/math/ode/EulerIntegrator.html">Euler</a></td><td>1</td></tr>
           <tr><td><a href="../apidocs/org/apache/commons/math/ode/MidpointIntegrator.html">Midpoint</a></td><td>2</td></tr>
@@ -147,7 +147,7 @@
         </p>
         <p>
           <table border="1" align="center">
-          <tr BGCOLOR="#CCCCFF"><td colspan=3><font size="+2">Adaptive Stepsize Integrators</font></td></tr>
+          <tr BGCOLOR="#CCCCFF"><td colspan="3"><font size="+2">Adaptive Stepsize Integrators</font></td></tr>
           <tr BGCOLOR="#EEEEFF"><font size="+1"><td>Name</td><td>Integration Order</td><td>Error Estimation Order</td></font></tr>
           <tr><td><a href="../apidocs/org/apache/commons/math/ode/HighamHall54Integrator.html">Higham and Hall</a></td><td>5</td><td>4</td></tr>
           <tr><td><a href="../apidocs/org/apache/commons/math/ode/DormandPrince54Integrator.html">Dormand-Prince 5(4)</a></td><td>5</td><td>4</td></tr>

xdocs/userguide/optimization.xml

@@ -42,6 +42,7 @@
             <li>
               they do not rely on residuals-based quadratic cost functions but
               handle any cost functions, including non-continuous ones! 
+            </li>
           </ul>
         </p>
       </subsection>