Principal Currents For A Pair Of Unitary Operators
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| Author | : Joel D. Pincus |
| Publisher | : American Mathematical Soc. |
| Total Pages | : 114 |
| Release | : 1994 |
| Genre | : Mathematics |
| ISBN | : 0821826093 |
The study of interrelationships between rectifiable currents associated to n-tuples of operators with commutators or multicommutators satisfying trace class conditions is the exploration of a non commutative spectral theory in which there is still a significant degree of localization at points in the current support - viewed as a non commutative spectrum. This memoir is a systematic development of the theory of principal functions in this the noncommutative case, and it generalizes extensive previous work of R. Carey and Pincus.
| Author | : Fritz Gesztesy |
| Publisher | : American Mathematical Soc. |
| Total Pages | : 102 |
| Release | : 1995 |
| Genre | : Mathematics |
| ISBN | : 0821804065 |
In the introductory section, we review the formulation of the Korteweg-de Vries (KdV) equation and of the modified KdV (mKdV) equation as a compatibility condition for a Lax pair of linear operators. We then illustrate Miura's transformation, which maps solutions of the mKdV into solutions of the KdV. We then give a general overview of the concept of soliton solutions relative to general backgrounds, and of the single and double commutation methods. Finally, we present the main results of the article. To avoid the clutter of too many technical details, the paper is organized in four sections and five appendices.
| Author | : Justin R. Smith |
| Publisher | : American Mathematical Soc. |
| Total Pages | : 154 |
| Release | : 1994 |
| Genre | : Mathematics |
| ISBN | : 0821825887 |
This paper develops a new invariant of a CW-complex called the m-structure and uses it to perform homotopy-theoretic computations. The m-structure of a space encapsulates the coproduct structure, as well as higher-coproduct structures that determine Steenrod-operations. Given an m-structure on the chain complex of a reduced simplicial complex of a pointed simply-connected space, one can equip the cobar construction of this chain-complex with a natural m-structure. This result allows one to form iterated cobar constructions that are shown to be homotopy equivalent to iterated loop-spaces.
| Author | : Carlos Andradas |
| Publisher | : American Mathematical Soc. |
| Total Pages | : 130 |
| Release | : 1995 |
| Genre | : Mathematics |
| ISBN | : 0821826123 |
A set which can be defined by systems of polynomial inequalities is called semialgebraic. When such a description is possible locally around every point, by means of analytic inequalities varying with the point, the set is called semianalytic. If one single system of strict inequalities is enough, either globally or locally at every point, the set is called basic. The topic of this work is the relationship between these two notions. Namely, Andradas and Ruiz describe and characterize, both algebraically and geometrically, the obstructions for a basic semianalytic set to be basic semialgebraic. Then they describe a special family of obstructions that suffices to recognize whether or not a basic semianalytic set is basic semialgebraic. Finally, they use the preceding results to discuss the effect on basicness of birational transformations.
| Author | : Mark Iosifovich Freĭdlin |
| Publisher | : American Mathematical Soc. |
| Total Pages | : 97 |
| Release | : 1994 |
| Genre | : Mathematics |
| ISBN | : 0821825860 |
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.
| Author | : Ran Levi |
| Publisher | : American Mathematical Soc. |
| Total Pages | : 121 |
| Release | : 1995 |
| Genre | : Mathematics |
| ISBN | : 0821804014 |
In part 1 we study the homology, homotopy, and stable homotopy of [capital Greek]Omega[italic capital]B[lowercase Greek]Pi[up arrowhead][over][subscript italic]p, where [italic capital]G is a finite [italic]p-perfect group. In part 2 we define the concept of resolutions by fibrations over an arbitrary family of spaces.
| Author | : A. L. Levin |
| Publisher | : American Mathematical Soc. |
| Total Pages | : 166 |
| Release | : 1994 |
| Genre | : Mathematics |
| ISBN | : 0821825992 |
Bounds for orthogonal polynomials which hold on the 'whole' interval of orthogonality are crucial to investigating mean convergence of orthogonal expansions, weighted approximation theory, and the structure of weighted spaces. This book focuses on a method of obtaining such bounds for orthogonal polynomials (and their Christoffel functions) associated with weights on [-1,1]. Also presented are uniform estimates of spacing of zeros of orthogonal polynomials and applications to weighted approximation theory.
| Author | : Eldar Straume |
| Publisher | : American Mathematical Soc. |
| Total Pages | : 106 |
| Release | : 1996 |
| Genre | : Mathematics |
| ISBN | : 082180409X |
The cohomogeneity of a transformation group ([italic capitals]G, X) is, by definition, the dimension of its orbit space, [italic]c = dim [italic capitals]X, G. By enlarging this simple numerical invariant, but suitably restricted, one gradually increases the complexity of orbit structures of transformation groups. This is a natural program for classical space forms, which traditionally constitute the first canonical family of testing spaces, due to their unique combination of topological simplicity and abundance in varieties of compact differentiable transformation groups.
| Author | : Henry L. Kurland |
| Publisher | : American Mathematical Soc. |
| Total Pages | : 199 |
| Release | : 1996 |
| Genre | : Mathematics |
| ISBN | : 0821804405 |
This memoir is a careful and detailed study of the intersection pairing in the Conley index. The Conley index associates to an isolated invariant set of a semiflow (with some mild compactness conditions) a homotopy type of a space, constructed to be invariant under perturbations of the flow. The homology of this space is the homology Conley index. For a (two-sided) flow, each isolated invariant set has two indices defined: one for the forward flow, and one for the reverse. In general, there is no relationship between these two indices, but when the flow is on an orientable manifold, the two indices can be related by an intersection pairing. It is this pairing that receives a careful and detailed study in this memoir. Results are then applied to the motivating example of the work: the existence of transition layer behavior for two-point boundary value problems of singularly perturbed systems.
| Author | : Peter D. T. A. Elliott |
| Publisher | : American Mathematical Soc. |
| Total Pages | : 102 |
| Release | : 1994 |
| Genre | : Mathematics |
| ISBN | : 0821825984 |
The correlation of multiplicative arithmetic functions on distinct arithmetic progressions and with values in the complex unit disc, cannot be continually near to its possible maximum unless each function is either very close to or very far from a generalized character. Moreover, under accessible condition the second possibility can be ruled out. As a consequence analogs of the standard limit theorems in probabilistic number theory are obtained with the classical single additive function on the integers replaced by a sum of two additive functions on distinct arithmetic progressions.
