As in the case of the two previous volumes published in 1986 and 1997, the purpose of this monograph is to focus the interplay between real (functional) analysis and stochastic analysis show their mutual benefits and advance the subjects. The presentation of each article, given as a chapter, is in a research-expository style covering the respective topics in depth. In fact, most of the details are included so that each work is essentially self contained and thus will be of use both for advanced graduate students and other researchers interested in the areas considered. Moreover, numerous new problems for future research are suggested in each chapter. The presented articles contain a substantial number of new results as well as unified and simplified accounts of previously known ones. A large part of the material cov­ ered is on stochastic differential equations on various structures, together with some applications. Although Brownian motion plays a key role, (semi-) martingale theory is important for a considerable extent. Moreover, noncommutative analysis and probabil­ ity have a prominent role in some chapters, with new ideas and results. A more detailed outline of each of the articles appears in the introduction and outline to assist readers in selecting and starting their work. All chapters have been reviewed.

The main subject of the book is stochastic analysis and its various applications to mathematical finance and statistics of random processes. The main purpose of the book is to present, in a short and sufficiently self-contained form, the methods and results of the contemporary theory of stochastic analysis and to show how these methods and results work in mathematical finance and statistics of random processes. The book can be considered as a textbook for both senior undergraduate and graduate courses on this subject. The book can be helpful for undergraduate and graduate students, instructors and specialists on stochastic analysis and its applications.

Wesentliche Zielsetzung dieses Buchs ist eine in sich abgeschlossene Darstellung der zur Lösung inverser Probleme notwendigen Kenntnisse von der mathematischen Analyse bis zur numerischen Lösung. Konkrete Anwendungsfälle aus Naturwissenschaften und Technik geben den Umfang der benötigten mathematischen Methoden vor. Dazu gehört insbesondere die stochastische Modellierung der unvorhersehbaren Störungen von Messdaten, die bisher in Lehrbüchern zu inversen und schlecht gestellten Problemen nicht berücksichtigt wird. Die stochastische Modellierung steht in engem Zusammenhang mit der für den Computereinsatz essentiellen Diskretisierung beziehungsweise Parametrisierung inverser Probleme, auf die besonderes Augenmerk gerichtet wird. Ein weiterer Schwerpunkt ist die praktische Lösung der aus der Diskretisierung resultierenden globalen, im Allgemeinen nichtlinearen Optimierungsprobleme. Hingegen wird auf die Besprechung einer abstrakten Theorie der Regularisierung verzichtet.

Stochastic differential equations have many applications in the natural sciences. Besides, the employment of probabilistic representations together with the Monte Carlo technique allows us to reduce solution of multi-dimensional problems for partial differential equations to integration of stochastic equations. This approach leads to powerful computational mathematics that is presented in the treatise.

With many updates and additional exercises, the second edition of this book continues to provide readers with a gentle introduction to rough path analysis and regularity structures, theories that have yielded many new insights into the analysis of stochastic differential equations, and, most recently, stochastic partial differential equations.

Collecting together twenty-three self-contained articles, this volume presents the current research of a number of renowned scientists in both probability theory and statistics as well as their various applications in economics, finance, the physics of wind-blown sand, queueing systems, risk assessment, turbulence and other areas.