Yamashiro Yasukazu

写真a

Title

Associate Professor

Researcher Number(JSPS Kakenhi)

70253929

Laboratory Address

1 Senbaru,Nishihara,Okinawa
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Current Affiliation Organization 【 display / non-display 】

  • Duty   University of the Ryukyus   Faculty of Education   Elementary and Secondary School Teacher Training Program   Associate Professor  

  • Concurrently   University of the Ryukyus   Graduate School of Education   Professional Teacher Education   Associate Professor  

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Academic degree 【 display / non-display 】

  • Chiba University -  Doctor of Science

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External Career 【 display / non-display 】

  • 2000.04
    　
    　

    - , University of the Ryukyus, Faculty of Education, Mathematics, Associate Professor  

  • 2000.04
    　
    　

     

  • 2000.04
    　
    　

    University of the Ryukyus, Faculty of Education, Mathematics, Associate Professor  

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Research Interests 【 display / non-display 】

  • 非可換環論，数学教育

  • 非可換環論

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Research Areas 【 display / non-display 】

  • Natural Science / Algebra

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Published Papers 【 display / non-display 】

  • HIRATA SEPARABLE EXTENSION OVER THE DESCENDING CHAIN OF SUBRINGS

    その他の著者

    Vol.24 (2011) ( Department of Mathematical Science, Faculty of Science, University of the Ryukyus )  24   117 - 121   2012.03

    Type of publication: Research paper (bulletin of university, research institution)

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    In [5], we considered the equivalent class of desending chains of subrings. In this note, we consider Hirata separable extension (H-separable extension) over the desending chain of subrings. Let Λ be a ring, Γ a subring of Λ, C the center of Λ and Δ the commutater of Γ in Λ. Λ is a Hirata separabale extension over Γ if and only if Δ is C-finitely generated projective and Λ ?_γ Λ ? Hom_c(Δ , Λ) by the map a ? b → [d → adb], where a ? b ∈ Λ ?_γ Λ and d ∈ Δ (Theorem 1.1 in [3]). （管理者追加）リポジトリ登録情報を移行しました。確認のうえ、加除修正をしてください。

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  • On equivalent class of descending chains of subrings

    その他の著者

    Vol.23 (2010) ( Department of Mathematical Science, Faculty of Science, University of the Ryukyus )  23   117 - 120   2011.02

    Type of publication: Research paper (bulletin of university, research institution)

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    In this note we consider the generalization of vertex of finite groups to noncommutative rings. Let K be a field with characteristic p, and G a finite group. For an indecomposable KG-module V, a p-subgroup P of G is vertex of V if P satisfies the following conditions:(a) V is P-projective (b) For any subgroup H of G, if V is H -projective then there exist t ∈ G such that P^t ∈ H. （管理者追加）リポジトリ登録情報を移行しました。確認のうえ、加除修正をしてください。

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  • A note on endomorphism rings of H-separable extensions

    その他の著者

    Vol.6 (1993) ( Department of Mathematical Sciences, College of Science, University of the Ryukyus )  6   79 - 85   2010.01

    Type of publication: Research paper (bulletin of university, research institution)

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    （管理者追加）リポジトリ登録情報を移行しました。確認のうえ、加除修正をしてください。

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  • Ring extensions and endomorphism rings of module

    Kazuhiko HIRATA, Yasukazu YAMASHIRO

    Tsukuba Journal of Mathematics   17 ( 1 ) 77 - 84   1993 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

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