els.html" class="code" title="function copy_labels(g,h)">copy_labels</a>	copy_labels(g,h) --- copy labels from h to g</li><li><a href="delete.html" class="code" title="function delete(g,i,j)">delete</a>	delete --- delete vertices or edges from a graph</li><li><a href="dfstree.html" class="code" title="function dfstree(t,g,v)">dfstree</a>	dfstree(t,g,v) --- create a depth-first spanning tree of g</li><li><a href="disjoint_union.html" class="code" title="function disjoint_union(g,h,k)">disjoint_union</a>	disj