758721.fig.001
Figure 1: An illustration of hierarchical lattice Ω 2 of order 2. The distances between three nodes 𝟎 = ( 0 , 0 , 0 , ) , 𝐱 = ( 1 , 0 , 0 , ) and 𝐲 = ( 0 , 1 , 0 , ) are 𝑑 ( 𝟎 , 𝐱 ) = 1 and 𝑑 ( 𝟎 , 𝐲 ) = 𝑑 ( 𝐱 , 𝐲 ) = 2 .