• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2002 Fiscal Year Final Research Report Summary

Ideals with large cardinal properties

Research Project

Project/Area Number 13640113
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field General mathematics (including Probability theory/Statistical mathematics)
Research InstitutionNagoya University

Principal Investigator

MATSUBARA Yo  Nagoya univ., grad.school of human info., asso.prof., 大学院・人間情報学研究科, 助教授 (30242788)

Co-Investigator(Kenkyū-buntansha) SHIOYA Masahiro  Tsukuba Univ., inst.of math., assi.prof., 数学系, 講師 (30251028)
ABE Yoshihiro  Kanagawa Univ., school of eng., asso.prof., 工学部, 助教授 (10159452)
YOSHINOBU Yasuo  Nagoya univ., grad.school of human info., assi., 大学院・人間情報学研究科, 助手 (90281063)
Project Period (FY) 2001 – 2002
Keywordsset theory / large cardinals
Research Abstract

Y.Matsubara and S.Shelah proved that the non-stationary ideal over P_κλ for every strong limit singular cardinal λ is nowhere precipitous. This implies that Menas' conjecture holds for strong limit singular cardinals λ.
Y.Matsubara defined the notion of strategically closed ideals. Using a supercompact cardinal, he constructed a model with a strategically closed ideal over P_κλ where κ is a regular cardinal 【greater than or equal】 N_2 for every λ>κ. He also proved that the existence of such ideals implies the singular cardinal hypothesis and Rado's conjecture.
If the poset P_I is proper, then we say that I is a proper ideal. In general if forcing with P_I preserves stationary subsets of P_κλ, then we say that I is a stationary preserving ideal. Matsubara proved that the existence of stationary preserving ideals is a large cardinal property. For example, he proved that if a proper ideal over P_<λ+>δ exists where δ is a cardinal sufficiently larger than λ, then the non-stationary ideal over P_<N1>λ is precipitous.
In 1985 Gitik proved the consistency of the existence of stationary subsets X of P_κλ such that the non-stationary ideal restricted to X is κ^+-saturated using a supercompact cardinal. Shioya gave a new proof of this theorem using a weaker hypothesis. Shioya and S.Shelah pro ed the existence of a non-reflecting stationary subset of P_κκ^+.
Yoshinobu investigated properties of partial orders using Banach-Mazur type games. He showed the hierarchical structure of strategically closed and strongly strategically closed partial orders. Yoshinobu together with M.Takahashi proved some basic properties of σ-short Boolean n algebras.

  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] Y.Matsubara: "Stationary preserving ideals over"Journal of the Mathematical Society of Japan.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Matsubara, S.Shelah: "Nowhere precipitousness of the non-stationary ideal over"Journal of Mathematical Logic. 2. 81-89 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Matsubara: "Stronger ideals over"Fundamenta Mathematicae. 174. 229-238 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Ishiu, Y.Yoshinobu: "Directive tree and games on posets"Proceedings of the American Mathematical Society. 130. 1477-1485 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Yoshinobu: "Approachability and games on posets"Journal of Symbolic Logic.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Shioya: "Generating the club filters on"Topology and it's Applications. 122. 415-419 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Matsubara: "Stationary preserving ideals over P_κλ"Journal of the Mathematical Society of Japan.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Matsubara: "Stronger ideals over P_κλ"Fundamenta Mathematicae. 174. 229-238 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Matsubara & S.Shelah: "Nowhere precipitousness of the non-stationary ideals over P_κλ"Journal of Mathematical Logic. 2. 81-89 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Ishiu & Y.Yoshinobu: "Directive tree and ganes on posets"Proceedings of the American Mathematical Society. 130. 1477-1485 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Shioya: "Generating the club filters on P_κλ"Topology and it's Applications. 122. 415-419 (2002)

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 2004-04-14  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi