 with different structures or node orders, there might be unexpected results. There is no check against pathological operations; we again assume you know what you are doing.</p><h2>List of implement operators<a name="3"></a></h2><p>Here is a brief list of implemented operators, with their common meaning. We assume that <tt>a</tt> is a tree and that <tt>b</tt> is either another tree or a scalar number. All binary operators support scalar expansion.</p><p>
<table border="5" cellspacing="5">
<caption>Standard 