an> <span class="symbol"><span class="name">Variable</span><span class="params">(<span name="variable">variable: <a href="MathExpr$.html#T=edu.stanford.nlp.trees.Tree" name="provingground.translation.MathExpr.T" id="provingground.translation.MathExpr.T" class="extmbr">T</a></span>)</span></span></li></ol></div><div class="values members"><h3>Value Members</h3><ol><li class="indented0 " name="scala.AnyRef#!=" group="Ungrouped" fullComment="yes" data-isabs="false" visbl="pub"><a id="!=(x$1:Any):Boolean"></a><