 value 1.0 if <var>x</var> &gt; 0 and <var>y</var> &gt; 0,  otherwise 0.0</dd>
<dt class="col-md-4"> <var>x</var> <samp>||</samp> <var>y</var></dt><dd class="col-md-8"> logical OR connective (inclusive), return value 1.0 if <var>x</var> &gt; 0 or <var>y</var> &gt; 0 (or both),  otherwise 0.0</dd>
<dt class="col-md-4"> <samp>~</samp><var>x</var></dt><dd class="col-md-8"> logical NOT operator, return value 1.0 if <var>not</var> <var>x</var> &gt; 0,  otherwise 0.0</dd>
<dt class="col-md-4"> <samp>+</samp><var>