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+<page xmlns="http://projectmallard.org/1.0/"
+      type="guide"
+      id="logarithm">
+
+    <info>
+        <link type="guide" xref="index#equation"/>
+    </info>
+
+	<title>Logarithms</title>
+    
+    <p>
+    Logarithms can be calculated using the log <link xref="function">function</link>.
+    </p>
+    <example>
+    <p>
+    log 100
+    </p>
+    </example>
+    <p>
+    To calculate a logarithm in a different base use a <link xref="superscript">subscript number</link> after the function.
+    </p>
+    <example>
+    <p>
+    log₂ 32
+    </p>
+    </example>
+    <p>
+    To calculate a natural logarithm use the ln function.
+    </p>
+    <example>
+    <p>
+    ln 1.32
+    </p>
+    </example>
+    <p>
+    Euler's number can be entered by using the <link xref="variable">variable</link> e.
+    </p>
+    <example>
+    <p>
+    e^1.32
+    </p>
+    </example>
+</page>