ass="col-md-4"> <var>x</var> <samp>!=</samp> <var>y</var></dt><dd class="col-md-8"> boolean relation, return value 1.0 if <var>x </var>!=<var> y</var>, otherwise 0.0</dd>
<dt class="col-md-4"> <var>x</var> <samp>&amp;</samp> <var>y</var></dt><dd class="col-md-8"> binary AND</dd>
<dt class="col-md-4"> <var>x</var> <samp>|</samp> <var>y</var></dt><dd class="col-md-8"> binary OR</dd>
<dt class="col-md-4"> <var>x</var> <samp>&amp;&amp;</samp> <var>y</var></dt><dd class="col-md-8"> logical AND connective, return