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This volume contains selected refereed papers based on lectures presented at the 'Fifth International Fez Conference on Commutative Algebra and Applications' that was held in Fez, Morocco in June 2008. The volume represents new trends and areas of classical research within the field, with contributions from many different countries. In addition, the volume has as a special focus the research and influence of Alain Bouvier on commutative algebra over the past thirty years.

Commutative algebra --- Algebra --- Algebraic Geometry. --- Algebraic Number Theory. --- Commutative Algebra. --- Module Theory. --- Monoid Theory.

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In this unique book, written in a reasonably self-contained manner, the theory of linear connections is systematically presented as a natural part of differential calculus over commutative algebras. This not only makes easy and natural numerous generalizations of the classical theory and reveals various new aspects of it, but also shows in a clear and transparent manner the intrinsic structure of the associated differential calculus. The notion of a "fat manifold" introduced here then allows the reader to build a well-working analogy of this "connection calculus" with the usual one.

Differential calculus. --- Commutative algebra. --- Manifolds (Mathematics) --- Algebras, Linear. --- Linear algebra --- Algebra, Universal --- Generalized spaces --- Mathematical analysis --- Calculus of operations --- Line geometry --- Topology --- Geometry, Differential --- Algebra --- Calculus, Differential --- Calculus

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This book treats the interaction between discrete convex geometry, commutative ring theory, algebraic K-theory, and algebraic geometry. The basic mathematical objects are lattice polytopes, rational cones, affine monoids, the algebras derived from them, and toric varieties. The book discusses several properties and invariants of these objects, such as efficient generation, unimodular triangulations and covers, basic theory of monoid rings, isomorphism problems and automorphism groups, homological properties and enumerative combinatorics. The last part is an extensive treatment of the K-theory of monoid rings, with extensions to toric varieties and their intersection theory. This monograph has been written with a view towards graduate students and researchers who want to study the cross-connections of algebra and discrete convex geometry. While the text has been written from an algebraist's view point, also specialists in lattice polytopes and related objects will find an up-to-date discussion of affine monoids and their combinatorial structure. Though the authors do not explicitly formulate algorithms, the book takes a constructive approach wherever possible. Winfried Bruns is Professor of Mathematics at Universität Osnabrück. Joseph Gubeladze is Professor of Mathematics at San Francisco State University.

K-theory. --- Polytopes. --- Rings (Algebra). --- Polytopes --- K-theory --- Rings (Algebra) --- Geometry --- Mathematics --- Physical Sciences & Mathematics --- Algebraic rings --- Ring theory --- Mathematics. --- Algebra. --- Commutative algebra. --- Commutative rings. --- Convex geometry. --- Discrete geometry. --- Commutative Rings and Algebras. --- K-Theory. --- Convex and Discrete Geometry. --- Algebraic topology --- Homology theory --- Combinatorial geometry --- Algebra --- Mathematical analysis --- Math --- Science --- Algebraic fields --- Hyperspace --- Topology --- Discrete groups. --- Groups, Discrete --- Infinite groups --- Discrete mathematics --- Convex geometry .

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Coding theory and cryptography allow secure and reliable data transmission, which is at the heart of modern communication. Nowadays, it is hard to find an electronic device without some code inside. Gröbner bases have emerged as the main tool in computational algebra, permitting numerous applications, both in theoretical contexts and in practical situations. This book is the first book ever giving a comprehensive overview on the application of commutative algebra to coding theory and cryptography. For example, all important properties of algebraic/geometric coding systems (including encoding, construction, decoding, list decoding) are individually analysed, reporting all significant approaches appeared in the literature. Also, stream ciphers, PK cryptography, symmetric cryptography and Polly Cracker systems deserve each a separate chapter, where all the relevant literature is reported and compared. While many short notes hint at new exciting directions, the reader will find that all chapters fit nicely within a unified notation.

Coding theory. --- Cryptography. --- Gro ̈bner bases. --- Grèobner bases --- Coding theory --- Cryptography --- Mathematics --- Physical Sciences & Mathematics --- Algebra --- Gröbner bases. --- Gröbner basis theory --- Cryptanalysis --- Cryptology --- Secret writing --- Steganography --- Mathematics. --- Data encryption (Computer science). --- Computers. --- Computer science --- Algebra. --- Discrete mathematics. --- Combinatorics. --- Discrete Mathematics. --- Data Encryption. --- Mathematics of Computing. --- Theory of Computation. --- Commutative algebra --- Signs and symbols --- Symbolism --- Writing --- Ciphers --- Data encryption (Computer science) --- Data compression (Telecommunication) --- Digital electronics --- Information theory --- Machine theory --- Signal theory (Telecommunication) --- Computer programming --- Computer science. --- Information theory. --- Cryptology. --- Communication theory --- Communication --- Cybernetics --- Informatics --- Science --- Data encoding (Computer science) --- Encryption of data (Computer science) --- Computer security --- Combinatorics --- Mathematical analysis --- Computer science—Mathematics. --- Discrete mathematical structures --- Mathematical structures, Discrete --- Structures, Discrete mathematical --- Numerical analysis --- Automatic computers --- Automatic data processors --- Computer hardware --- Computing machines (Computers) --- Electronic brains --- Electronic calculating-machines --- Electronic computers --- Hardware, Computer --- Computer systems --- Calculators --- Cyberspace