α
1
α
2, …, αp are n-dimensional vectors,
,
;
they are arranged to form a closed polygon
.
Denote by R(α
1, α
2, …, α
p) the radius of the smallest circumscribed hypersphere with centre at 0 ; by R(α
1, α
2, …, α
p) the minimum of
(α
1, α
2, …, α
p)
for all possible reorderings
of α
2, …, α
p−1 and by cn the least possible constant such that
for all possible choices of p and α
1
α
2, … , α
p.