Bulletin of the Faculty of Science, Ibaraki University. Series A, Mathematics

Online ISSN : 1883-4345
Print ISSN : 0579-3068
ISSN-L : 0579-3068

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Volume 14

Displaying 1-6 of 6 articles from this issue

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Krull Properties of Semigroup Rings

Ryuki MATSUDA

1982Volume 14 Pages 1-12
Published: May 31, 1982
Released on J-STAGE: July 09, 2009

DOIhttps://doi.org/10.5036/bfsiu1968.14.1

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Oscillation Theorems for Non-liner Delay Differential Equations

R.S. DAHIYA

1982Volume 14 Pages 13-18
Published: May 31, 1982
Released on J-STAGE: January 07, 2010

DOIhttps://doi.org/10.5036/bfsiu1968.14.13

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First, an oscillation theorem is presented for the n-th order delay differential equation
\[ (r(t)x'(t))^(n-1)+∑^k_{i=1}f_i(t)F_i(x_{τ_i}(t), x'_{τ_i}(t), ..., x^(n-1)_{τ_i}(t))=b(t), \ \ r(t)>0.\]
Then the asymptotic behavior of bounded oscillatory solutions of the above equations is investigated.

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A Remark on the Littlewood Conjecture

Kozo YABUTA

1982Volume 14 Pages 19-21
Published: May 31, 1982
Released on J-STAGE: July 09, 2009

DOIhttps://doi.org/10.5036/bfsiu1968.14.19

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A Note on Homomorphisms of C^*-algebras

Sin-ei TAKAHASI

1982Volume 14 Pages 23-24
Published: May 31, 1982
Released on J-STAGE: July 09, 2009

DOIhttps://doi.org/10.5036/bfsiu1968.14.23

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On Semigroups of the Poisson Transforms and Groups of Boundary Values of the Poisson Transforms on Weighted L^p Spaces

Katsuo TAKANO

1982Volume 14 Pages 25-33
Published: May 31, 1982
Released on J-STAGE: July 09, 2009

DOIhttps://doi.org/10.5036/bfsiu1968.14.25

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On the Submultiplicative classes

Dedicated to Professor Kentaro MURATA on his 60th birthday

Kunio OSHIMA, Sigeru OKAMOTO

1982Volume 14 Pages 35-39
Published: May 31, 1982
Released on J-STAGE: July 09, 2009

DOIhttps://doi.org/10.5036/bfsiu1968.14.35

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In his paper [3], K. Oshima characterized a certain classes of submultiplicative matrix norms. It is intent of this paper to extend his work. The main result will be given in the diagram.

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