Studies Cauchy problems that are not well-posed in the classical sense. This volume presents and examines three major approaches to treating such problems: semigroup methods, abstract distribution methods, and regularization methods.

Accessible to nonspecialists and beginning graduate students, this volume brings together many different ideas to serve as a reference on modern methods for abstract linear evolution equations.

Preface. Introduction. ILLUSTRATION AND MOTIVATION. Heat Equation. The Reversed Cauchy Problem for the Heat Equation. Wave Equation. SEMIGROUP METHODS. C0-Semigroups. Integrated Semigroups. k-Convoluted Semigroups. C-Regularized Semigroups. Degenerate Semigroups. The Cauchy Problem for Inclusions. Second Order Equations. ABSTRACT DISTRIBUTION METHODS. The Cauchy Problem. The Degenerate Cauchy Problem. Ultradistributions and New Distributions. REGULARIZATION METHODS. The Ill-Posed Cauchy Problem. Regularization and C-Regularized Semigroups. BIBLIOGRAPY. GLOSSARY OF NOTATION. INDEX.