Project/Area Number  10640110 
Research Category 
GrantinAid for Scientific Research (C).

Section  一般 
Research Field 
General mathematics (including Probability theory/Statistical mathematics)

Research Institution  NIIGATA UNIVERSITY 
Principal Investigator 
AKASHI Shigeo Department of Science, NIIGATA UNIVERSITY Associate Professor, 理学部, 助教授 (30202518)

CoInvestigator(Kenkyūbuntansha) 
ASANO Kazuo Department of Science, NIIGATA UNIVERSITY Lecturer, 理学部, 講師 (80000876)
TAKEUCHI Teruo Department of Science, NIIGATA UNIVERSITY Associate Professor, 理学部, 助教授 (10018848)
ISOGAI Eiichi Department of Science, NIIGATA UNIVERSITY Professor, 理学部, 教授 (40108014)
SAITOH Kichisuke Department of Science, NIIGATA UNIVERSITY Professor, 理学部, 教授 (30018949)
田中 謙輔 新潟大学, 理学部, 教授 (70018258)
SUZUKI Tomonari Graduate School of Science and Technology, NIIGATA UNIVERSITY Assistant, 大学院・自然科学研究科, 助手 (00303173)

Project Fiscal Year 
1998 – 1999

Project Status 
Completed(Fiscal Year 1999)

Budget Amount *help 
¥3,700,000 (Direct Cost : ¥3,700,000)
Fiscal Year 1999 : ¥1,700,000 (Direct Cost : ¥1,700,000)
Fiscal Year 1998 : ¥2,000,000 (Direct Cost : ¥2,000,000)

Keywords  quantum information / entropy / data compression / compact mapping / reproducing kernel Hilbert space / 量子情報 / エントロピー / データ圧縮 / コンパクト写像 / 再生核Hilbert空間 
Research Abstract 
(1). New locally convex topologies constructed with some families of nuclear operators on a separable Hilbert space which are weaker than the norm topology and stronger than the weak topology are given. These topologies are applied to the classification of nuclear operators. Further, the homeomorphism problem of subspaces with the norms in terms of the ranges of the closed unit ball under nuclear operators is treated. This result is applied to the homeomorphism problem of periodic and continuously differentiable function spaces included by LィイD12ィエD1[0,1]. (2). The homeomorphism problems of subspaces with norms in terms of the ranges of the closed unit ball under compact positive operators are examined. These results will be applied to the operator theoretical classification of reproducing kernel Hilbert spaces. (3). It is shown that Ohya's entropy dimension on a WィイD1*ィエD1dynamical system is timeinvariant, and homeomorphism problems of operator algebras equipped with the quasi σstrong operator topologies are discussed. (4). A formula for estimating εentropy of a compact positive operator in terms of the distribution of proper values of such an operator was given by Prosser and Root. In this paper, an inversion formula for estimating the distribution of proper values of a compact positive operator in terms of εentropy of such an operator is given. (5). The homeomorphism problem of compact nonlinear mappings on a locally convex topological vector space is studied under the method of dimension theory. First of all, dimension theoretic homeomorphism invariants which are defined on the set of all compact nonlinear mappings are introduced. Next, these invariants are applied to dimension theoretic characterization of the fixed point sets which these compact nonlinear mapping have.
