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Symmetrization in Analysis New Mathematical Monographs Series, Vol. 36

Langue : Anglais

Auteur :

Couverture de l’ouvrage Symmetrization in Analysis
Symmetrization is a rich area of mathematical analysis whose history reaches back to antiquity. This book presents many aspects of the theory, including symmetric decreasing rearrangement and circular and Steiner symmetrization in Euclidean spaces, spheres and hyperbolic spaces. Many energies, frequencies, capacities, eigenvalues, perimeters and function norms are shown to either decrease or increase under symmetrization. The book begins by focusing on Euclidean space, building up from two-point polarization with respect to hyperplanes. Background material in geometric measure theory and analysis is carefully developed, yielding self-contained proofs of all the major theorems. This leads to the analysis of functions defined on spheres and hyperbolic spaces, and then to convolutions, multiple integrals and hypercontractivity of the Poisson semigroup. The author's star function, which preserves subharmonicity, is developed with applications to semilinear PDEs. The book concludes with a thorough self-contained account of the star function's role in complex analysis, covering value distribution theory, conformal mapping and the hyperbolic metric.
Foreword Walter Hayman; Preface David Drasin and Richard S. Laugesen; Introduction; 1. Rearrangements; 2. Main inequalities on Rn; 3. Dirichlet integral inequalities; 4. Geometric isoperimetric and sharp Sobolev inequalities; 5. Isoperimetric inequalities for physical quantities; 6. Steiner symmetrization; 7. Symmetrization on spheres, and hyperbolic and Gauss spaces; 8. Convolution and beyond; 9. The *-function; 10. Comparison principles for semilinear Poisson PDEs; 11. The *-function in complex analysis; References; Index.
Albert Baernstein II was Professor in the Department of Mathematics at Washington University in St. Louis before his death in 2014. He gained international renown for innovative solutions to extremal problems in complex and harmonic analysis. His invention of the “star function” method in the 1970s prompted an invitation to the International Congress of Mathematicians held in Helsinki in 1978, and during the 1980s and 90s he substantially extended the breadth and applications of this method.

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