r_kind"><span class="modifier"></span> <span class="kind">def</span></span> <span class="symbol"><span class="name">jet</span><span class="params">(<span name="expr">expr: <a href="Expression.html" name="provingground.learning.Expression" id="provingground.learning.Expression" class="extype">Expression</a></span>)</span><span class="result">: <span name="spire.math.Jet" class="extype">Jet</span>[<span name="scala.Double" class="extype">Double</span>]</span></span><p class="shortcomment cmt">Recursive jet fo