span name="provingground.induction.TypFamilyExst.apply.Fib" class="extype">Fib</span>]</span>, <span name="In">In &lt;: <span name="shapeless.HList" class="extype">HList</span></span>]</span><span class="params">(<span name="tf">tf: <a href="TypFamilyPtn.html" name="provingground.induction.TypFamilyPtn" id="provingground.induction.TypFamilyPtn" class="extype">TypFamilyPtn</a>[<a href="../HoTT$$Term.html" name="provingground.HoTT.Term" id="provingground.HoTT.Term" class="extype">Term</a>, <span name="proving