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Minkowski sum of semi-convex domains in ℝ²

Sung Woo Choi — 2002

The Minkowski sum of two sets A, B in ℝⁿ is defined to be the set of all points of the form a + b for a ∈ A and b ∈ B. Due to its fundamental nature, the Minkowski sum is an important object in many practical application areas such as image processing, geometric design, robotics, etc. However, compared to the simplicity of the definition, a Minkowski sum of plane domains can have quite complicated topological and geometric features in general. This is the case even when the summands are relatively...

The Daugavet equation for polynomials

Yun Sung ChoiDomingo GarcíaManuel MaestreMiguel Martín — 2007

Studia Mathematica

We study when the Daugavet equation is satisfied for weakly compact polynomials on a Banach space X, i.e. when the equality ||Id + P|| = 1 + ||P|| is satisfied for all weakly compact polynomials P: X → X. We show that this is the case when X = C(K), the real or complex space of continuous functions on a compact space K without isolated points. We also study the alternative Daugavet equation m a x | ω | = 1 | | I d + ω P | | = 1 + | | P | | for polynomials P: X → X. We show that this equation holds for every polynomial on the complex space X =...

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