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Gini coefficient --- Mathematical statistics

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Forest canopies. --- Wind tunnel testing. --- Drag coefficient

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Thermal insulation --- Thermal conductivity --- Heat transfer coefficient

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Fluid mechanics. --- Flow meters. --- Diffusion coefficient

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The purpose of this book is twofold. Our starting point is the design of layered media with a prescribed reflection coefficient. In the first part of this book we show that the space of physically realizable reflection coefficients is rather restricted by a number of properties. In the second part we consider a constrained approximation problem in Hardy spaces. This can be viewed as an optimization problem for the frequency response of a causal LTI system with limited gain.

Reflecton coefficient --- Helmholtz equation --- Extremal problems in Hardy spaces --- LTI systems --- Analytic approximation --- Reflection coefficient