class="permalink"><a href="../../provingground/translation/MathExpr$$Variable.html#variable:provingground.translation.MathExpr.T" title="Permalink"><i class="material-icons"></i></a></span> <span class="modifier_kind"><span class="modifier"></span> <span class="kind">val</span></span> <span class="symbol"><span class="name">variable</span><span class="result">: <a href="MathExpr$.html#T=edu.stanford.nlp.trees.Tree" name="provingground.translation.MathExpr.T" id="provingground.translation.MathExpr.T" clas