K-Iterated line digraph

[math]\displaystyle{ k }[/math]-Iterated line digraph --- [math]\displaystyle{ k }[/math]-итерационный рёберный орграф.

Setting [math]\displaystyle{ L^{0}G = G }[/math], for any integer [math]\displaystyle{ k \geq 1 }[/math] the [math]\displaystyle{ k }[/math]-iterated line digraph, [math]\displaystyle{ L^{k}G }[/math], is defined recursively by [math]\displaystyle{ L^{k}G = LL^{k-1}G }[/math].