| FullText URL | mjou_061_159_166.pdf |
|---|---|
| Author | Tasaka, Fuminori| |
| Abstract | A 2-block of a finite group having a Klein four hyperfocal subgroup has the same number of irreducible Brauer characters as the corresponding 2-block of the normalizer of the hyperfocal subgroup. |
| Keywords | group theory modular representation hyperfocal subgroup |
| Published Date | 2019-01 |
| Publication Title | Mathematical Journal of Okayama University |
| Volume | volume61 |
| Issue | issue1 |
| Publisher | Department of Mathematics, Faculty of Science, Okayama University |
| Start Page | 159 |
| End Page | 166 |
| ISSN | 0030-1566 |
| NCID | AA00723502 |
| Content Type | Journal Article |
| language | 英語 |
| Copyright Holders | Copyright©2019 by the Editorial Board of Mathematical Journal of Okayama University |
| FullText URL | mjou_061_167_172.pdf |
|---|---|
| Author | Brown, Stephen C.| Davis, Chad T.| |
| Abstract | Due to a theorem of Dedekind, factoring ideals generated by prime numbers in number fields is easily done given that said prime number does not divide the index of the field. In this paper, we determine the prime ideal factorizations of both 2 and 3 in cyclic quartic fields whose index is divisible by one of or both of these primes. |
| Keywords | Cyclic quartic field Prime ideal factorization |
| Published Date | 2019-01 |
| Publication Title | Mathematical Journal of Okayama University |
| Volume | volume61 |
| Issue | issue1 |
| Publisher | Department of Mathematics, Faculty of Science, Okayama University |
| Start Page | 167 |
| End Page | 172 |
| ISSN | 0030-1566 |
| NCID | AA00723502 |
| Content Type | Journal Article |
| language | 英語 |
| Copyright Holders | Copyright©2019 by the Editorial Board of Mathematical Journal of Okayama University |
| FullText URL | mjou_061_173_186.pdf |
|---|---|
| Author | Sato, Yuichiro| |
| Abstract | This paper gives, in generic situations, a complete classification of ruled minimal surfaces in pseudo-Euclidean space with arbitrary index. In addition, we discuss the condition for ruled minimal surfaces to exist, and give a counter-example on the problem of Bernstein type. |
| Keywords | minimal surface ruled surface pseudo-Euclidean space |
| Published Date | 2019-01 |
| Publication Title | Mathematical Journal of Okayama University |
| Volume | volume61 |
| Issue | issue1 |
| Publisher | Department of Mathematics, Faculty of Science, Okayama University |
| Start Page | 173 |
| End Page | 186 |
| ISSN | 0030-1566 |
| NCID | AA00723502 |
| Content Type | Journal Article |
| language | 英語 |
| Copyright Holders | Copyright©2019 by the Editorial Board of Mathematical Journal of Okayama University |
| FullText URL | mjou_061_187_198.pdf |
|---|---|
| Author | Rashid, M.H.M.| |
| Abstract | A Banach space operator satisfies property (Bw) if the complement of its B-Weyl spectrum in its the spectrum is the set of finite multiplicity isolated eigenvalues of the operator. Property (Bw) does not transfer from operators T and S to their tensor product T ⊗ S. We give necessary and /or sufficient conditions ensuring the passage of property (Bw) from T and S to T ⊗ S. Perturbations by Riesz operators are considered. |
| Keywords | property (Bw) SVEP tensor product |
| Published Date | 2019-01 |
| Publication Title | Mathematical Journal of Okayama University |
| Volume | volume61 |
| Issue | issue1 |
| Publisher | Department of Mathematics, Faculty of Science, Okayama University |
| Start Page | 187 |
| End Page | 198 |
| ISSN | 0030-1566 |
| NCID | AA00723502 |
| Content Type | Journal Article |
| language | 英語 |
| Copyright Holders | Copyright©2019 by the Editorial Board of Mathematical Journal of Okayama University |
| FullText URL | mjou_061_199_204.pdf |
|---|---|
| Author | Hamid, Nur| Oura, Manabu| |
| Abstract | The Terwilliger algebra plays an important role in the theory of association schemes. The present paper gives the explicit structures of the Terwilliger algebras of the group association schemes of the finite groups PSL(2, 7), A6, and S6. |
| Keywords | Terwilliger algebragroup association scheme |
| Published Date | 2019-01 |
| Publication Title | Mathematical Journal of Okayama University |
| Volume | volume61 |
| Issue | issue1 |
| Publisher | Department of Mathematics, Faculty of Science, Okayama University |
| Start Page | 199 |
| End Page | 204 |
| ISSN | 0030-1566 |
| NCID | AA00723502 |
| Content Type | Journal Article |
| language | 英語 |
| Copyright Holders | Copyright©2019 by the Editorial Board of Mathematical Journal of Okayama University |
| FullText URL | mjou_062_001_025.pdf |
|---|---|
| Author | Ohara, Mariko| |
| Abstract | In this paper, we study K-theory of spectral schemes by using locally free sheaves. Let us regard the K-theory as a functor K on affine spectral schemes. Then, we prove that the group completion ΩB<sup>G</sup>(B<sup>G</sup>GL) represents the sheafification of K with respect to Zariski (resp. Nisnevich) topology G, where B<sup>G</sup>GL is a classifying space of a colimit of affine spectral schemes GLn. |
| Keywords | Infinity category Derived algebraic geometry K-theory |
| Published Date | 2020-01 |
| Publication Title | Mathematical Journal of Okayama University |
| Volume | volume62 |
| Issue | issue1 |
| Publisher | Department of Mathematics, Faculty of Science, Okayama University |
| Start Page | 1 |
| End Page | 25 |
| ISSN | 0030-1566 |
| NCID | AA00723502 |
| Content Type | Journal Article |
| language | 英語 |
| Copyright Holders | Copyright©2020 by the Editorial Board of Mathematical Journal of Okayama University |
| Author | Oshima, Hideaki| Oshima, Katsumi| |
|---|---|
| Keywords | Toda bracket Unstable higher Toda bracket Higher composition Cofibration Coextension Extension |
| Published Date | 2020-01 |
| Publication Title | Mathematical Journal of Okayama University |
| Volume | volume62 |
| Issue | issue1 |
| Publisher | Department of Mathematics, Faculty of Science, Okayama University |
| Start Page | 27 |
| End Page | 86 |
| ISSN | 0030-1566 |
| NCID | AA00723502 |
| Content Type | Journal Article |
| language | 英語 |
| Copyright Holders | Copyright©2020 by the Editorial Board of Mathematical Journal of Okayama University |
| FullText URL | mjou_062_087_178.pdf |
|---|---|
| Author | Hiroshima, Toya| |
| Abstract | The branching coefficients of the tensor product of finite-dimensional irreducible Uq(g)-modules, where g is so(2n + 1, C) (Bn-type), sp(2n,C) (Cn-type), and so(2n,C) (Dn-type), are expressed in terms of Littlewood-Richardson (LR) coefficients in the stable region. We give an interpretation of this relation by Kashiwara’s crystal theory by providing an explicit surjection from the LR crystal of type Cn to the disjoint union of Cartesian product of LR crystals of An−1-type and by proving that LR crystals of types Bn and Dn are identical to the corresponding LR crystal of type Cn in the stable region. |
| Keywords | Kashiwara crystals Littlewood-Richardson crystals Kashiwara-Nakashima tableaux Branching rule |
| Published Date | 2020-01 |
| Publication Title | Mathematical Journal of Okayama University |
| Volume | volume62 |
| Issue | issue1 |
| Publisher | Department of Mathematics, Faculty of Science, Okayama University |
| Start Page | 87 |
| End Page | 178 |
| ISSN | 0030-1566 |
| NCID | AA00723502 |
| Content Type | Journal Article |
| language | 英語 |
| Copyright Holders | Copyright©2020 by the Editorial Board of Mathematical Journal of Okayama University |
| FullText URL | mjou_062_179_195.pdf |
|---|---|
| Author | Fujimori, Shoichi| Kawakami, Yu| Kokubu, Masatoshi| Rossman, Wayne| Umehara, Masaaki| Yamada, Kotaro| |
| Abstract | Catenoids in de Sitter 3-space S<sup>3</sup><sub>1</sub> belong to a certain class of space-like constant mean curvature one surfaces. In a previous work, the authors classified such catenoids, and found that two different classes of countably many exceptional elliptic catenoids are not realized as closed subsets in S<sup>3</sup><sub>1</sub> . Here we show that such exceptional catenoids have closed analytic extensions in S<sup>3</sup><sub>1</sub> with interesting properties. |
| Keywords | constant mean curvature de Sitter space analytic extension |
| Published Date | 2020-01 |
| Publication Title | Mathematical Journal of Okayama University |
| Volume | volume62 |
| Issue | issue1 |
| Publisher | Department of Mathematics, Faculty of Science, Okayama University |
| Start Page | 179 |
| End Page | 195 |
| ISSN | 0030-1566 |
| NCID | AA00723502 |
| Content Type | Journal Article |
| language | 英語 |
| Copyright Holders | Copyright©2020 by the Editorial Board of Mathematical Journal of Okayama University |
| FullText URL | mjou_062_197_210.pdf |
|---|---|
| Author | Amy Poh Ai Ling| Taniguchi, Masaharu| |
| Abstract | The existence and stability of the Allen–Cahn equation discretized in space and time are studied in a finite spatial interval. If a parameter is less than or equals to a critical value, the zero solution is the only stationary solution. If the parameter is larger than the critical value, one has a positive stationary solution and this positive stationary solution is asymptotically stable. |
| Keywords | Allen–Cahn equation stationary solution comparison theorem discretized |
| Published Date | 2020-01 |
| Publication Title | Mathematical Journal of Okayama University |
| Volume | volume62 |
| Issue | issue1 |
| Publisher | Department of Mathematics, Faculty of Science, Okayama University |
| Start Page | 197 |
| End Page | 210 |
| ISSN | 0030-1566 |
| NCID | AA00723502 |
| Content Type | Journal Article |
| language | 英語 |
| Copyright Holders | Copyright©2020 by the Editorial Board of Mathematical Journal of Okayama University |
