Anderson's Theorem - Statement of The Theorem

Statement of The Theorem

Let K be a convex body in n-dimensional Euclidean space Rn that is symmetric with respect to reflection in the origin, i.e. K = −K. Let f : RnR be a non-negative, symmetric, globally integrable function; i.e.

  • f(x) ≥ 0 for all xRn;
  • f(x) = f(−x) for all xRn;

Suppose also that the super-level sets L(f, t) of f, defined by

are convex subsets of Rn for every t ≥ 0. (This property is sometimes referred to as being unimodal.) Then, for any 0 ≤ c ≤ 1 and yRn,

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