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Kodai Mathematical Journal最新文献

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On the rank of elliptic curves arising from Pythagorean quadruplets 关于由毕达哥拉斯四联体产生的椭圆曲线的秩
IF 0.6 4区 数学
Kodai Mathematical Journal Pub Date : 2020-03-15 DOI: 10.2996/kmj/1584345690
A. S. Zargar
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引用次数: 2
Gradient estimates of a general porous medium equation for the V-Laplacian 一般多孔介质v -拉普拉斯方程的梯度估计
IF 0.6 4区 数学
Kodai Mathematical Journal Pub Date : 2020-03-15 DOI: 10.2996/kmj/1584345686
Hongbing Qiu
{"title":"Gradient estimates of a general porous medium equation for the V-Laplacian","authors":"Hongbing Qiu","doi":"10.2996/kmj/1584345686","DOIUrl":"https://doi.org/10.2996/kmj/1584345686","url":null,"abstract":"","PeriodicalId":54747,"journal":{"name":"Kodai Mathematical Journal","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45264785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
$r$-Almost Newton-Ricci solitons immersed in a Lorentzian manifold: examples, nonexistence and rigidity $r$-几乎牛顿-里奇孤立子浸入洛伦兹流形：例子、不存在性和刚性
IF 0.6 4区 数学
Kodai Mathematical Journal Pub Date : 2020-03-15 DOI: 10.2996/kmj/1584345687
A. W. Cunha, Eudes L. de Lima, H. Lima
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引用次数: 0
Lagrangian submanifolds of $S^6$ and the associative Grassmann manifold $S^6$的拉格朗日子流形与结合Grassmann流形
IF 0.6 4区 数学
Kodai Mathematical Journal Pub Date : 2020-03-15 DOI: 10.2996/kmj/1584345693
Kanako Enoyoshi, K. Tsukada
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引用次数: 2
A note on the extendability of holomorphic motions 关于全纯运动的可扩展性的注解
IF 0.6 4区 数学
Kodai Mathematical Journal Pub Date : 2020-03-15 DOI: 10.2996/kmj/1584345692
H. Shiga
{"title":"A note on the extendability of holomorphic motions","authors":"H. Shiga","doi":"10.2996/kmj/1584345692","DOIUrl":"https://doi.org/10.2996/kmj/1584345692","url":null,"abstract":"","PeriodicalId":54747,"journal":{"name":"Kodai Mathematical Journal","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45223475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Surfaces in pseudo-Riemannian space forms with zero mean curvature vector 具有零平均曲率向量的伪黎曼空间形式中的曲面
IF 0.6 4区 数学
Kodai Mathematical Journal Pub Date : 2020-03-15 DOI: 10.2996/kmj/1584345694
N. Ando
{"title":"Surfaces in pseudo-Riemannian space forms with zero mean curvature vector","authors":"N. Ando","doi":"10.2996/kmj/1584345694","DOIUrl":"https://doi.org/10.2996/kmj/1584345694","url":null,"abstract":"","PeriodicalId":54747,"journal":{"name":"Kodai Mathematical Journal","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46369200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Monotonicity of eigenvalues of the $p$-Laplace operator under the Ricci-Bourguignon flow Ricci-Burguignon流下$p$-Laplace算子特征值的单调性
IF 0.6 4区 数学
Kodai Mathematical Journal Pub Date : 2020-03-15 DOI: 10.2996/kmj/1584345691
Ha Tuan Dung
{"title":"Monotonicity of eigenvalues of the $p$-Laplace operator under the Ricci-Bourguignon flow","authors":"Ha Tuan Dung","doi":"10.2996/kmj/1584345691","DOIUrl":"https://doi.org/10.2996/kmj/1584345691","url":null,"abstract":"","PeriodicalId":54747,"journal":{"name":"Kodai Mathematical Journal","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45442635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Singularities of the dual curve of a certain plane curve in positive characteristic 某平面曲线正特性对偶曲线的奇异性
IF 0.6 4区 数学
Kodai Mathematical Journal Pub Date : 2020-02-25 DOI: 10.2996/kmj44110
K. Komeda
{"title":"Singularities of the dual curve of a certain plane curve in positive characteristic","authors":"K. Komeda","doi":"10.2996/kmj44110","DOIUrl":"https://doi.org/10.2996/kmj44110","url":null,"abstract":"It is well known that the Gauss map for a complex plane curve is birational, whereas the Gauss map in positive characteristic is not always birational. Let $q$ be a power of a prime integer. We study a certain plane curve of degree $q^2+q+1$ for which the Gauss map is inseparable with inseparable degree $q$. As a special case, we show a relation between the dual curve of the Fermat curve of degree $q^2+q+1$ and the Ballico-Hefez curve.","PeriodicalId":54747,"journal":{"name":"Kodai Mathematical Journal","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49588755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The characterization of cyclic cubic fields with power integral bases 幂积分基循环立方场的表征
IF 0.6 4区 数学
Kodai Mathematical Journal Pub Date : 2019-12-06 DOI: 10.2996/kmj44204
Tomokazu Kashio, Ryutaro Sekigawa
{"title":"The characterization of cyclic cubic fields with power integral bases","authors":"Tomokazu Kashio, Ryutaro Sekigawa","doi":"10.2996/kmj44204","DOIUrl":"https://doi.org/10.2996/kmj44204","url":null,"abstract":"We provide an equivalent condition for the monogenity of the ring of integers of any cyclic cubic field. We show that if a cyclic cubic field is monogenic then it is a simplest cubic field $K_t$ which is the splitting field of a Shanks cubic polynomial $f_t(x):=x^3-tx^2-(t + 3)x-1$ with $t in mathbb Z$. Moreover we give an equivalent condition for when $K_t$ is monogenic, which is explicitly written in terms of $t$.","PeriodicalId":54747,"journal":{"name":"Kodai Mathematical Journal","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2019-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44747079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
On the Assouad dimension and convergence of metric spaces 度量空间的共轭维数及其收敛性
IF 0.6 4区 数学
Kodai Mathematical Journal Pub Date : 2019-11-18 DOI: 10.2996/kmj/1605063629
Yoshito Ishiki
{"title":"On the Assouad dimension and convergence of metric spaces","authors":"Yoshito Ishiki","doi":"10.2996/kmj/1605063629","DOIUrl":"https://doi.org/10.2996/kmj/1605063629","url":null,"abstract":"We introduce the notion of pseudo-cones of metric spaces as a generalization of both of the tangent cones and the asymptotic cones. We prove that the Assouad dimension of a metric space is bounded from below by that of any pseudo-cone of it. We exhibit a example containing all compact metric spaces as pseudo-cones, and examples containing all proper length spaces as tangent cones or asymptotic cones.","PeriodicalId":54747,"journal":{"name":"Kodai Mathematical Journal","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2019-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46794553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
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