        [a &gt; 0]
(%i4) context:initial;
(%o4)                        initial
(%i5) is(a&gt;0);
(%o5)                        unknown
(%i6) activate(mycontext);
(%o6)                         done
(%i7) is(a&gt;0);
(%o7)                         true
</pre></dd></dl>

<p><a name="deactivate"></a>
</p><dl>
<dt><u>Funktion:</u> <b>deactivate</b><i> (<var>context_1</var>, &hellip;, <var>context_n</var>)</i>
<a name="IDX477"></a>
</dt>
<dd><p>Die Kontexte <var>context_1</var>, &hellip;, <var>context_n</var> werde