The distribution of the eigenvalues of differential operators has long fascinated mathematicians. Advances have shed light upon classical problems in this area, and this book presents a fresh approach, largely based upon the results of the authors. The emphasis here is on a topic of central importance in analysis, namely the relationship between i) function spaces on Euclidean n-space and on domains; ii) entropy numbers in quasi-Banach spaces; and iii) the distribution of the eigenvalues of degenerate elliptic (pseudo) differential operators. The treatment is largely self-contained and accessible to non-specialists. Both experts and newcomers alike will welcome this unique exposition.
Review of the hardback:‘… a fresh approach.’
Source: L'Enseignement Mathématique
Review of the hardback:‘The authors’ mastery of the subject is obvious, and they make every effort to guide the reader through the difficult analysis … The book is recommended to anyone with an interest in function spaces and differential equations.’
W. D. Evans Source: Bulletin of the London Mathematical Society
Review of the hardback:‘… not only an excellent research monograph but also an appropriate introduction to the field.’
H. G. Feichtinger Source: International Mathematical News
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