la.Predef.Map" class="extype">Map</span>[<a href="Expression.html" name="provingground.learning.Expression" id="provingground.learning.Expression" class="extype">Expression</a>, <span name="scala.Double" class="extype">Double</span>]</span>)</span><span class="result"> extends <span name="scala.Product" class="extype">Product</span> with <a href="../../scala/index.html#Serializable=java.io.Serializable" name="scala.Serializable" id="scala.Serializable" class="extmbr">Serializable</a></span></span></h4><div 