  <h3>Abstract Value Members</h3>
              <ol><li name="org.saddle.index.Stacker#apply" visbl="pub" data-isabs="true" fullComment="yes" group="Ungrouped">
      <a id="apply(ix1:org.saddle.Index[I],ix2:org.saddle.Index[J]):org.saddle.Index[O]"></a>
      <a id="apply(Index[I],Index[J]):Index[O]"></a>
      <h4 class="signature">
      <span class="modifier_kind">
        <span class="modifier">abstract </span>
        <span class="kind">def</span>
      </span>
      <span class="symbol">
        <spa