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1998 Fiscal Year Final Research Report Summary

Calculus of Variation and Geometric Structures on Manifolds

Research Project

Project/Area Number 09640139
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Geometry
Research InstitutionFukuoka Institute of Technology

Principal Investigator

ITOKAWA Yoe  Fukuoka Institute of Technology, Faculty of Information Engineering, Associate Professor., 情報工学部, 助教授 (90223205)

Co-Investigator(Kenkyū-buntansha) NISHIBATA Shinya  Fukuoka Institute of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (80279299)
NISHIHARA Masaru  Fukuoka Institute of Technology, Faculty of Information Engineering, Professor, 情報工学部, 教授 (20112287)
Project Period (FY) 1997 – 1998
Keywordsmanifolds / minimal varieties / sectional curvature / Ricci curvature / homology / complex locally convex spaces / systems of P.D.E. / entropy function
Research Abstract

The head investigator, Yoe Itokawa, in a joint research project with Katsuhiro Shiohama, has shown that complete minimal varieties in complete noncompact manifolds of positive sectional curvature necessarily have unbounded images. The head investigator has obtained some partial results concerning the case where the ambient spaces have only nonnegative curvature, but he is still undecided whether to publish the latter results or wait for further information. In another work, this time with Ryoichi Kobayashi, the head investigator has classified the <planck's constant>-1 -dimensional homology groups of manifolds of nonnegatively Ricci curvature under some relatively weak conditions on the growth rate of their cross-sectional size. The last results were described in the paper"Minimizing currents in open manifolds and <planck's constant>-1 homology of nonnegatively Ricci curved m
The investigator Masaru Nishihara has continued his investigation on the extendability of weakly continuous polynomials on a comples locally convex space E to its bidual space E". He has published his results in the paper "On extensions of holomorphic functions in infinite dimensional spaces" in Proceedings of the Sixth International Colloquium on Complex Analysis.
The investigator Sinya Nishibata has studied systems of coupled hyperbokic and elliptic P.D.E.'s. He was able to prove that the existence of entropy function is equivalent to the simultaneous diagonability of the system and that, under this condition, classical techniques can be used to establish the short-term existence of solutions. In addition, he has also shown that under stability assumptions, long term solutions also exist and when t tends to*, they converge to equilibrium states.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Lesile Coghlan and Yoe Itokawa: "Aninjectivity radius estimate and stability of minimal submanifolds" Kyushu Journal of Mathematics. 51-1. 255-238 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoe Itokawa and Katsuhiro Shiohama: "The unbounded ness of certain minimal submanifolds of positively curved riemannian spaces" Differential Geometry and its Applications. 発表予定.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Masaru Nishihara: "On extensions of holomorphic functions in infinite dimensional spaces" Proceedings of the Sixth International Colloguium on Complex analysis. 33-34 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shuichi Kawashima and Shinya Nishibata: "Shock Waves for a model system of radiating gas" SIMA Journal of Mathematical Analysis. 発表予定.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shuichi Kawashima and Shinya Nishibata: "Cauchy problom for radiating gas dynamics : weak solutions with jumps and classical solutions" Mathematical Models and Methodsin Applied Sciences. 発表予定.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shuichi Kawashima, Yoshiko Niikuni, and Shinya Nishibata: "The initial vabne problem for hyperbolic-elliptic coupled system and applications to radiation hydrodynainics" Analysis of Systems of Conservation Laws. 発表予定.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Leslie Coghlan and Yoe Itokawa: "An injectivity radius and stability of minimal submanifolds" Kyushyu Journal of Mathmatics. 51-10. 225-238 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yoe Itokawa and Katsuhiro Shiohama: "The unboundedness of certain minimal submanifolds of positively curved riemannian spaces" Differential Geometry and Its Applications. (To appear).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Masaru Nishihara: "On extensions of holomorphic functions in infinite dimensional spaces" Proceedings of the Sixth International Colloquium on Complex Analysis. 33-43 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shuichi Kawashima and Shinya Nishibata: "Shock Waves for a model system of radiating gas" SIAM Journal of Mathemtical Analysis. (To appear).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shuichi Kawashima and Shinya Nishibata: "Cauchy problem for radiating gas dynamics : weak solutions with jumps and classical solutions" Mathematical Models and Methods in Applied Sciences. (To appear).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shuichi Kawashima, Yoshiko Niikuni, and Shinya Nishibata: The initial value problem for hyperbolicelliptic coupled system and applications to radiating hydrodynamics Analysis of Systems of Conservation Laws. Addison-Wesley (To appear),

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

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Published: 1999-12-08  

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