内容简介
With the publication of Volumes III and IV we have completed our presentation of the material which we originally planned as "Volume II" at the time of publication of Volume I. We originally promised the publisher that the entire series would be completed nine months after we submitted Volume I. Well! We have listed the contents of future volumes below. We are not foolhardy enough to make any predictions.
目录
Preface
Introduction
Contents of Other Volumes
XII: PERTURBATION OF POINT SPECTRA
1. Finite-dimensional perturbation theory
Appendix Algebraic and geometric multiplicity of eigenvalues of finite matrices
2. Regular perturbation theory
3. Asymptotic perturbation theory
4. Summability methods in perturbation theory
5. Spectral concentration
6. Resonances and the Fermi golden rule
Notes
Problems
XlII: SPECTRAL ANALYSIS
1. The rain-max principle
2. Bound states of Schr‘6dinger operators I: Quantitative methods
3. Bound states of Schr‘odinger operators II: Qualitative theory
A. Is disc (H)finite or infinite?
B. Bounds on N(V) in the central case
C. Bounds on N(V) in the general two-body case
4. Locating the essential spectrum I: Weyl's theorem
5. Locating the essential spectrum III: Tire HVZ theorem
6. The absence of singular continuous spectrum I: General theory
7. The absence of singular continuous spectrum II: Smooth perturbations
A. Weakly coupled quantum systems
B. Positive commutators and repulsive potentials
C. Local smoothness and wave operators for repulsive potentials
8. The absence of singular continuous spectrum III: Weighted L2 spaces
9. The spectrum ofctensor products
10.The absence of singular continuous spectrum IV: Dilation analytic potentials
11. Properties of eigenfitnctions
12. Nondegeneracy of the ground state
Appendix 1 The Beurling-Deny criteria
Appendix 2 The Levy-Khintchinecformula
13. Absence of positive eigenvalues
Appendix Unique continuation theorems for Schrodinger operators
14. Compactness criteria and operators with compact resolvent
15. The asymptotic distribution of eigenvalues
16. Schr6dinger operators with periodic potentials
17. An introduction to the specral theory of non-self-adjoint operators
Notes
Problems
List of Symbols
Index
前言/序言
现代数学物理方法(第4卷) 下载 mobi epub pdf txt 电子书 格式
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广义上讲,电子商务一词源自于Electronic Business,就是通过电子手段进行的商业事务活动。通过使用互联网等电子工具,使公司内部、供应商、客户和合作伙伴之间,利用电子业务共享信息,实现企业间业务流程的电子化,配合企业内部的电子化生产管理系统,提高企业的生产、库存、流通和资金等各个环节的效率。[1]
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广义上讲,电子商务一词源自于Electronic Business,就是通过电子手段进行的商业事务活动。通过使用互联网等电子工具,使公司内部、供应商、客户和合作伙伴之间,利用电子业务共享信息,实现企业间业务流程的电子化,配合企业内部的电子化生产管理系统,提高企业的生产、库存、流通和资金等各个环节的效率。[1]
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一、交易平台
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狭义上讲,电子商务(Electronic Commerce,简称EC)是指:通过使用互联网等电子工具(这些工具包括电报、电话、广播、电视、传真、计算机、计算机网络、移动通信等)在全球范围内进行的商务贸易活动。是以计算机网络为基础所进行的各种商务活动,包括商品和服务的提供者、广告商、消费者、中介商等有关各方行为的总和。人们一般理解的电子商务是指狭义上的电子商务。