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Number Theory
  • Language: en
  • Pages: 460

Number Theory

In 34 refereed papers from the conference at Dalhousie University in July 1994, research mathematicians discuss analytic, algebraic, and computational number theory. Among the specific topics are the number of genera of positive-definite integral ternary quadratic forms, five formulas of Ramanujan arising from Eisenstein series, the average value of class numbers in cyclic extensions of the rational function field, and some refinements of an algorithm of Brillhart. No index. Member price is $53. Annotation copyright by Book News, Inc., Portland, OR

Coherence for Tricategories
  • Language: en
  • Pages: 94

Coherence for Tricategories

This work defines the concept of tricategory as the natural 3-dimensional generalization of bicategory. Trihomomorphism and triequivalence for tricategories are also defined so as to extend the concepts of homomorphism and biequivalence for bicategories.

Associated Graded Algebra of a Gorenstein Artin Algebra
  • Language: en
  • Pages: 128

Associated Graded Algebra of a Gorenstein Artin Algebra

In 1904, Macaulay described the Hilbert function of the intersection of two plane curve branches: It is the sum of a sequence of functions of simple form. This monograph describes the structure of the tangent cone of the intersection underlying this symmetry. Iarrobino generalizes Macaulay's result beyond complete intersections in two variables to Gorenstein Artin algebras in an arbitrary number of variables. He shows that the tangent cone of a Gorenstein singularity contains a sequence of ideals whose successive quotients are reflexive modules. Applications are given to determining the multiplicity and orders of generators of Gorenstein ideals and to problems of deforming singular mapping germs. Also included are a survey of results concerning the Hilbert function of Gorenstein Artin algebras and an extensive bibliography.

Random Perturbations of Hamiltonian Systems
  • Language: en
  • Pages: 97

Random Perturbations of Hamiltonian Systems

Random perturbations of Hamiltonian systems in Euclidean spaces lead to stochastic processes on graphs, and these graphs are defined by the Hamiltonian. In the case of white-noise type perturbations, the limiting process will be a diffusion process on the graph. Its characteristics are expressed through the Hamiltonian and the characteristics of the noise. Freidlin and Wentzell calculate the process on the graph under certain conditions and develop a technique which allows consideration of a number of asymptotic problems. The Dirichlet problem for corresponding elliptic equations with a small parameter are connected with boundary problems on the graph.

The $2$-Dimensional Attractor of $x'(t)=-{\mu } x(t) + f(x(t-1))$
  • Language: en
  • Pages: 89

The $2$-Dimensional Attractor of $x'(t)=-{\mu } x(t) + f(x(t-1))$

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From Complexity to Creativity
  • Language: en
  • Pages: 393

From Complexity to Creativity

Cybernetic pioneer Warren McCullough asked: "What is a man, that he may know a number; and what is a number, that a man may know it?" Thinking along much the same lines, my question here is: "What is a creative mind, that it might emerge from a complex system; and what is a complex system, that it might give rise to a creative mind?" Complexity science is a fashionable topic these days. My perspective on complexity, however, is a somewhat unusual one: I am interested in complex systems science principally as it reflects on abstract mathematical, computational models of mind. In my three previous books, The Structure of Intelligence, Evolving Mind, and Chaotic Logic, I have outlined a compreh...

The Lighter Side of Mathematics: Proceedings of the Eugene Strens Memorial Conference on Recreational Mathematics and Its History
  • Language: en
  • Pages: 379

The Lighter Side of Mathematics: Proceedings of the Eugene Strens Memorial Conference on Recreational Mathematics and Its History

In August of 1986, a special conference on recreational mathematics was held at the University of Calgary to celebrate the founding of the Strens Collection. Leading practitioners of recreational mathematics from around the world gathered in Calgary to share with each other the joy and spirit of play that is to be found in recreational mathematics. It would be difficult to find a better collection of wonderful articles on recreational mathematics by a more distinguished group of authors. If you are interested in tessellations, Escher, tilings, Rubik's cube, pentominoes, games, puzzles, the arbelos, Henry Dudeney, or change ringing, then this book is for you.

Hilbert Modules over Operator Algebras
  • Language: en
  • Pages: 69

Hilbert Modules over Operator Algebras

Addresses the three-dimensional generalization of category, offering a full definition of tricategory; a proof of the coherence theorem for tricategories; and a modern source of material on Gray's tensor product of 2-categories. Of interest to research mathematicians; theoretical physicists, algebraic topologists; 3-D computer scientists; and theoretical computer scientists. Society members, $19.00. No index. Annotation copyright by Book News, Inc., Portland, OR

Pseudofunctors on Modules with Zero Dimensional Support
  • Language: en
  • Pages: 73

Pseudofunctors on Modules with Zero Dimensional Support

Pseudofunctors with values on modules with zero dimensional support are constructed over the formally smooth category and residually finite category. Combining those pseudofunctors, a pseudofunctor over the category whose objects are Noetherian local rings and whose morphisms are local with finitely generated residue field extensions is constructed.

Prime Ideals in Skew and $q$-Skew Polynomial Rings
  • Language: en
  • Pages: 118

Prime Ideals in Skew and $q$-Skew Polynomial Rings

New methods are developed to describe prime ideals in skew polynomial rings [italic capital]S = [italic capital]R[[italic]y; [lowercase Greek]Tau, [lowercase Greek]Delta]], for automorphisms [lowercase Greek]Tau and [lowercase Greek]Tau-derivations [lowercase Greek]Delta] of a noetherian coefficient ring [italic capital]R.