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Sets with a Prescribed Number of Power Invariants
Authors:V V Makeev
Institution:(1) St.Petersburg State University, Russia
Abstract:Let A1,...,An be points in 
$$\mathbb{R}^d$$
, let 
$${O} \in {\mathbb{R}}^{d} $$
be a fixed point, let p be a positive integer, and let lambda1,...,lambdan be positive real numbers. If the 
$$s_p (M)= \sum_{i=1}^n \lambda_i |A_iM|^{2p}$$
does not depend on the position of M on a sphere with center O, then one says that the point system {A1,...,An} has an invariant of degree p with weight system {lambda,...,lambdan}. It is proved that for arbitrary positive integers d and N there exists a finite point system 
$$\left\{ {{A}_{1} , \ldots ,{A}_{n} } \right\} \subset {\mathbb{R}}^{d} $$
having invariants of degrees p=1,...,N with common positive weight system {lambda1,...,lambdan}. Bibliography: 2 titles.
Keywords:
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