et</span>[<a href="Equation.html" name="provingground.learning.Equation" id="provingground.learning.Equation" class="extype">Equation</a>]*</span>)</span><span class="result">: <span name="scala.Predef.Set" class="extype">Set</span>[<a href="Equation.html" name="provingground.learning.Equation" id="provingground.learning.Equation" class="extype">Equation</a>]</span></span></li><li class="indented0 " name="scala.AnyRef#ne" group="Ungrouped" fullComment="yes" data-isabs="false" visbl="pub"><a id="ne(x$1:AnyRe