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Recovering an homogeneous polynomial from moments of its level set. (English) Zbl 1311.44009
Summary: Let \(K:=\{ x:g(x)\leq 1\}\) be the compact (and not necessarily convex) sub-level set of some homogeneous polynomial \(g\). Assume that the only knowledge about \(K\) is the degree of \(g\) as well as the moments of the Lebesgue measure on \(K\) up to order \(2d\). Then the vector of coefficients of is the solution of a simple linear system whose associated matrix is nonsingular. In other words, the moments up to order \(2d\) of the Lebesgue measure on \(K\) encode all information on the homogeneous polynomial \(g\) that defines \(K\) (in fact, only moments of order \(d\) and \(2d\) are needed).

MSC:
44A60 Moment problems
26C10 Real polynomials: location of zeros
52A22 Random convex sets and integral geometry (aspects of convex geometry)
94A08 Image processing (compression, reconstruction, etc.) in information and communication theory
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