There are three possible distances between elements of the
binary tetrahedral group (not counting 0 and pi): They are
g = pi/3
The distance between points x and y in the group is their
angular distance, which can be computed as arccos(x.y).
These distances are given in the Table
of Distances. (Browser's note: this table displays
correctly in Netscape, but may not for you.)
p = pi/2
v = 2*pi/3.
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