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+<page xmlns="http://projectmallard.org/1.0/"
+      type="guide"
+      id="boolean">
+
+    <info>
+        <link type="guide" xref="index#equation"/>
+    </info>
+
+	<title>Boolean Algebra</title>
+    
+    <p>
+    Boolean algebra can be calculated using the AND, OR and XOR operators.
+    </p>
+    <example>
+    <p>
+    010011₂ AND 110101₂
+    </p>
+    </example>
+    <p>
+    Buttons for these symbols are available in <link xref="mouse">programming mode</link>.
+    </p>
+    <p>
+    The NOT <link xref="function">function</link> inverts the bits in a number.
+    The word size is set from the <guiseq><gui>Calculator</gui><gui>Preferences</gui></guiseq> menu.
+    </p>
+    <example>
+    <p>
+    NOT 010011₂
+    </p>
+    </example>
+</page>