pi(fibre:U):U" title="Permalink"><i class="material-icons"></i></a></span> <span class="modifier_kind"><span class="modifier">abstract </span> <span class="kind">def</span></span> <span class="symbol"><span class="name">pi</span><span class="params">(<span name="fibre">fibre: <span name="provingground.translation.TermRec.U" class="extype">U</span></span>)</span><span class="result">: <span name="provingground.translation.TermRec.U" class="extype">U</span></span></span></li><li class="indented0 " name="pr