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 <title>The Mathematical Constants</title>
 <link rel="stylesheet" href="../math.css" type="text/css">
 <meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
-<link rel="home" href="../index.html" title="Math Toolkit 2.10.0">
+<link rel="home" href="../index.html" title="Math Toolkit 2.11.0">
 <link rel="up" href="../constants.html" title="Chapter&#160;4.&#160;Mathematical Constants">
 <link rel="prev" href="tutorial/user_def.html" title="Use With User-Defined Types">
 <link rel="next" href="new_const.html" title="Defining New Constants">
               </p>
             </td>
 <td>
+              <p>
+                Equivalent to POSIX constant M_SQRT2
+              </p>
             </td>
 </tr>
 <tr>
               </p>
             </td>
 <td>
+              <p>
+                Equivalent to POSIX constant M_LN2
+              </p>
             </td>
 </tr>
 <tr>
               </p>
             </td>
 <td>
+              <p>
+                Equivalent to POSIX constant M_LN10
+              </p>
             </td>
 </tr>
 <tr>
               </p>
             </td>
 <td>
+              <p>
+                Equivalent to POSIX constant M_SQRT1_2
+              </p>
             </td>
 </tr>
 <tr>
             </td>
 <td>
               <p>
-                Ubiquitous. Archimedes constant <a href="http://en.wikipedia.org/wiki/Pi" target="_top">&#960;</a>
+                Ubiquitous. Archimedes constant <a href="http://en.wikipedia.org/wiki/Pi" target="_top">&#960;</a>.
+                Equivalent to POSIX constant M_PI
               </p>
             </td>
 </tr>
               </p>
             </td>
 <td>
+              <p>
+                Equivalent to POSIX constant M_PI2
+              </p>
             </td>
 </tr>
 <tr>
 <tr>
 <td>
               <p>
+                quarter_pi
+              </p>
+            </td>
+<td>
+              <p>
+                &#960;/4
+              </p>
+            </td>
+<td>
+              <p>
+                0.78539816
+              </p>
+            </td>
+<td>
+              <p>
+                Equivalent to POSIX constant M_PI_4
+              </p>
+            </td>
+</tr>
+<tr>
+<td>
+              <p>
                 sixth_pi
               </p>
             </td>
 <tr>
 <td>
               <p>
+                one_div_pi
+              </p>
+            </td>
+<td>
+              <p>
+                1/&#960;
+              </p>
+            </td>
+<td>
+              <p>
+                0.31830988
+              </p>
+            </td>
+<td>
+              <p>
+                Equivalent to POSIX constant M_1_PI
+              </p>
+            </td>
+</tr>
+<tr>
+<td>
+              <p>
+                two_div_pi
+              </p>
+            </td>
+<td>
+              <p>
+                2/&#960;
+              </p>
+            </td>
+<td>
+              <p>
+                0.63661977
+              </p>
+            </td>
+<td>
+              <p>
+                Equivalent to POSIX constant M_2_PI
+              </p>
+            </td>
+</tr>
+<tr>
+<td>
+              <p>
                 one_div_root_pi
               </p>
             </td>
 <tr>
 <td>
               <p>
+                two_div_root_pi
+              </p>
+            </td>
+<td>
+              <p>
+                2/&#8730;&#960;
+              </p>
+            </td>
+<td>
+              <p>
+                1.128379
+              </p>
+            </td>
+<td>
+              <p>
+                Equivalent to POSIX constant M_2_SQRTPI
+              </p>
+            </td>
+</tr>
+<tr>
+<td>
+              <p>
                 one_div_root_two_pi
               </p>
             </td>
 <td>
               <p>
                 <a href="http://en.wikipedia.org/wiki/E_(mathematical_constant)" target="_top">Euler's
-                constant e</a>
+                constant e</a>, equivalent to POSIX constant M_E
               </p>
             </td>
 </tr>
               </p>
             </td>
 <td>
+              <p>
+                Equivalent to POSIX constant M_LOG10E
+              </p>
             </td>
 </tr>
 <tr>
 <tr>
 <td>
               <p>
+                log2_e
+              </p>
+            </td>
+<td>
+              <p>
+                log<sub>2</sub>(e)
+              </p>
+            </td>
+<td>
+              <p>
+                1.442695
+              </p>
+            </td>
+<td>
+              <p>
+                This is the same as 1/ln(2) and is equivalent to POSIX constant M_LOG2E
+              </p>
+            </td>
+</tr>
+<tr>
+<td>
+              <p>
                 <span class="bold"><strong>Trigonometric</strong></span>
               </p>
             </td>