Abstract

In this paper, we study entropy maximisation problems in order to reconstruct functions or measures subject to very general integral constraints. Our work has a twofold purpose. We first make a global synthesis of entropy maximisation problems in the case of a single reconstruction (measure or function) from the convex analysis point of view, as well as in the framework of the embedding into the Maximum Entropy on the Mean (MEM) setting. We further propose an extension of the entropy methods for a multidimensional case.

Highlights

  • In some problems coming from applied physics, a multidimensional function f taking values in Rp ought to be reconstructed given a set of observations

  • We study a reconstruction problem in which constraints are defined as integrals involving the unknown function f and the weight function λ against suitable measures Φ, see expressions (1.1) and (1.3)

  • We propose a global synthesis of the entropy maximisation methods for such reconstruction problems from the convex analysis point of view, as well as in the framework of the embedding into the Maximum Entropy on the Mean (MEM) setting

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Summary

Introduction

In some problems coming from applied physics, a multidimensional function f taking values in Rp ought to be reconstructed given a set of observations. We propose a global synthesis of the entropy maximisation methods for such reconstruction problems from the convex analysis point of view, as well as in the framework of the embedding into the MEM setting. It consists in the study of the entropy methods for the reconstruction of a multidimensional function submitted to very general constraints such as an integral inverse problem as in (1.3). We consider first some simple examples of single function reconstructions and a two-functions case study inspired by computational thermodynamics

The specific γ-entropy maximisation problem for a single reconstruction
Transfer principle
Maximum entropy problem
Maximum Entropy on the Mean
Connection with classical minimisation problems
Linear transfer principle for the multidimensional case
The embedding into the MEM framework for the multidimensional case
Applications
Reconstruction of an univariate convex function
The analytic solution is
Reconstruction of a bivariate polynomial function
Phase diagram with an ideal solution

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