Delfs, Hans
Overview
Works:  4 works in 62 publications in 2 languages and 1,727 library holdings 

Roles:  Author, Editor 
Classifications:  QA3, 005.82 
Publication Timeline
.
Most widely held works by
Hans Delfs
Locally semialgebraic spaces by
Hans Delfs(
Book
)
36 editions published between 1985 and 1991 in 3 languages and held by 683 WorldCat member libraries worldwide
Locally semialgebraic spaces serve as an appropriate framework for studying the topological properties of varieties and semialgebraic sets over a real closed field. This book contributes to the fundamental theory of semialgebraic topology and falls into two main parts. The first dealswith sheaves and their cohomology on spaces which locally look like a constructible subset of a real spectrum. Topics like families of support, homotopy, acyclic sheaves, basechange theorems and cohomological dimension are considered. In the second part a homology theory for locally complete locally semialgebraic spaces over a real closed field is developed, the semialgebraic analogue of classical BoreMoorehomology. Topics include fundamental classes of manifolds and varieties, Poincare duality, extensions of the base field and a comparison with the classical theory. Applying semialgebraic BorelMoorehomology, a semialgebraic ("topological") approach to intersection theory on varieties over an algebraically closed field of characteristic zero is given. The book is addressed to researchers and advanced students in real algebraic geometry and related areas
36 editions published between 1985 and 1991 in 3 languages and held by 683 WorldCat member libraries worldwide
Locally semialgebraic spaces serve as an appropriate framework for studying the topological properties of varieties and semialgebraic sets over a real closed field. This book contributes to the fundamental theory of semialgebraic topology and falls into two main parts. The first dealswith sheaves and their cohomology on spaces which locally look like a constructible subset of a real spectrum. Topics like families of support, homotopy, acyclic sheaves, basechange theorems and cohomological dimension are considered. In the second part a homology theory for locally complete locally semialgebraic spaces over a real closed field is developed, the semialgebraic analogue of classical BoreMoorehomology. Topics include fundamental classes of manifolds and varieties, Poincare duality, extensions of the base field and a comparison with the classical theory. Applying semialgebraic BorelMoorehomology, a semialgebraic ("topological") approach to intersection theory on varieties over an algebraically closed field of characteristic zero is given. The book is addressed to researchers and advanced students in real algebraic geometry and related areas
Introduction to cryptography : principles and applications by
Hans Delfs(
Book
)
3 editions published between 2007 and 2015 in English and held by 128 WorldCat member libraries worldwide
"In the first part, this book covers the key concepts of cryptography on an undergraduate level, from encryption and digital signatures to cryptographic protocols. Essential techniques are demonstrated in protocols for key exchange, user identification, electronic elections and digital cash. In the second part, more advanced topics are addressed, such as the bit security of oneway functions and computationally perfect pseudorandom bit generators. The security of cryptographic schemes is a central topic. Typical examples of provably secure encryption and signature schemes and their security proofs are given. Though particular attention is given to the mathematical foundations, no special background in mathematics is presumed. The necessary algebra, number theory and probability theory are included in the appendix. Each chapter closes with a collection of exercises."Jacket
3 editions published between 2007 and 2015 in English and held by 128 WorldCat member libraries worldwide
"In the first part, this book covers the key concepts of cryptography on an undergraduate level, from encryption and digital signatures to cryptographic protocols. Essential techniques are demonstrated in protocols for key exchange, user identification, electronic elections and digital cash. In the second part, more advanced topics are addressed, such as the bit security of oneway functions and computationally perfect pseudorandom bit generators. The security of cryptographic schemes is a central topic. Typical examples of provably secure encryption and signature schemes and their security proofs are given. Though particular attention is given to the mathematical foundations, no special background in mathematics is presumed. The necessary algebra, number theory and probability theory are included in the appendix. Each chapter closes with a collection of exercises."Jacket
Der gesamte Briefwechsel : "Die absolute Wahrheit, so wie ich sie fühle" by
Ernst Ludwig Kirchner(
Book
)
21 editions published in 2010 in German and held by 88 WorldCat member libraries worldwide
21 editions published in 2010 in German and held by 88 WorldCat member libraries worldwide
Kohomologie affiner semialgebraischer Räume by
Hans Delfs(
Book
)
2 editions published in 1980 in German and held by 23 WorldCat member libraries worldwide
2 editions published in 1980 in German and held by 23 WorldCat member libraries worldwide
Audience Level
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Associated Subjects
Algebraic spaces Categories (Mathematics) Coding theory Computer networksSecurity measures Computer science Computer scienceMathematics Computer security Cryptography Data encryption (Computer science) Data protection Data structures (Computer science) Geometry, Algebraic Homology theory Homotopy theory Mathematics Number theory Topology