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
.