Noble
Polyhedra with 'Ih' (icosahedral) symmetry and 3
gonality
Notes: In
all
cases one representative face has been highlighted. This face
remains solid through the various displays in the VRML
window. Pressing the 'frame' hud button will display a
'framework' version of the figure, 'hull' will then display the
figure with a framework convex hull, 'solid' returns to the initial
view.
ID-2
Hull: Icosidodecahedron
Gonality / Valence: 3 / 12
V-E-F: 30-180-120
Genus / Wiener Index: 16 / 880
ID-4
Hull: Icosidodecahedron
Gonality / Valence: 3 / 12
V-E-F: 30-180-120
Genus / Wiener Index: 16 / 904
ID-6 Hull:
Icosidodecahedron
Gonality / Valence: 3 /
12 V-E-F:
30-180-120 Genus
/ Wiener Index: 16 /1110
The Wiener
Index is more specifically the Geometric Wiener Index, which is the
sum of the shortest paths (along the edges) between any two
vertices. I find it a useful metric as apart from some
duplication in the Kepler-Poinsot cases it gives a unique value for
every noble polyhedron even when truncated to an integer. In
all cases the polyehdra are scaled to a radius of 1 for this
calculation.The topological
Wiener
Index (which is the sum of the number of edges traversed) is
described in wikipedia
and in
Wolfram
Mathworld. The 'geometric' variant used here is an
extension of this using the sum of actual edge
lengths.