发布求助
文献互助 智能选刊 最新文献

Tokyo Journal of Mathematics最新文献

筛选
英文 中文
On the Structure of Generalized Polarized Manifolds with Relatively Small Second Class 具有相对小二阶的广义极化流形的结构
IF 0.6 4区 数学
Tokyo Journal of Mathematics Pub Date : 2021-09-01 DOI: 10.3836/tjm/1502179348
A. Lanteri, A. L. Tironi
{"title":"On the Structure of Generalized Polarized Manifolds with Relatively Small Second Class","authors":"A. Lanteri, A. L. Tironi","doi":"10.3836/tjm/1502179348","DOIUrl":"https://doi.org/10.3836/tjm/1502179348","url":null,"abstract":"","PeriodicalId":48976,"journal":{"name":"Tokyo Journal of Mathematics","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70165819","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
On the Motive of Codimension 2 Linear Sections of $mathrm{Gr}(3,6)$ $ mathm {Gr}(3,6)$的余维2线性截面的动机
IF 0.6 4区 数学
Tokyo Journal of Mathematics Pub Date : 2021-09-01 DOI: 10.3836/tjm/1502179351
R. Laterveer
{"title":"On the Motive of Codimension 2 Linear Sections of $mathrm{Gr}(3,6)$","authors":"R. Laterveer","doi":"10.3836/tjm/1502179351","DOIUrl":"https://doi.org/10.3836/tjm/1502179351","url":null,"abstract":"We consider Fano sevenfolds $Y$ obtained by intersecting the Grassmannian $mathrm{Gr}(3,6)$ with a codimension 2 linear subspace (with respect to the Pl\"ucker embedding). We prove that the motive of $Y$ is Kimura finite-dimensional. We also prove the generalized Hodge conjecture for all powers of $Y$.","PeriodicalId":48976,"journal":{"name":"Tokyo Journal of Mathematics","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41746515","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
Some Results on Invariant Measures for $1$-dimensional Maps 关于$1$维映射不变测度的一些结果
IF 0.6 4区 数学
Tokyo Journal of Mathematics Pub Date : 2021-09-01 DOI: 10.3836/tjm/1502179353
F. Schweiger
{"title":"Some Results on Invariant Measures for $1$-dimensional Maps","authors":"F. Schweiger","doi":"10.3836/tjm/1502179353","DOIUrl":"https://doi.org/10.3836/tjm/1502179353","url":null,"abstract":"For many fibred systems the existence of an invariant measure can be proved but considerably less is known about the shape of the density. In this note various examples of invariant densities are discussed: Piecewise fractional linear maps with four branches and maps which are associated to continued fractions with increasing digits. There are ergodic maps with a non-integrable density which do not have an indifferent fixed point and maps such that the set of points which miss the digit $k=1$ has positive Lebesgue measure.","PeriodicalId":48976,"journal":{"name":"Tokyo Journal of Mathematics","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46292721","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 Diophantine Equation $X^3=u+v$ over Real Quadratic Fields, II 实二次域上的丢番图方程$X^3=u+v$， II
IF 0.6 4区 数学
Tokyo Journal of Mathematics Pub Date : 2021-08-01 DOI: 10.3836/tjm/1502179345
T. Kagawa
{"title":"The Diophantine Equation $X^3=u+v$ over Real Quadratic Fields, II","authors":"T. Kagawa","doi":"10.3836/tjm/1502179345","DOIUrl":"https://doi.org/10.3836/tjm/1502179345","url":null,"abstract":"","PeriodicalId":48976,"journal":{"name":"Tokyo Journal of Mathematics","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43019663","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
On the $lambda$-invariant of Selmer Groups Arising from Certain Quadratic Twists of Gross Curves 由某些粗糙曲线的二次扭转引起的Selmer群的$ λ $-不变量
IF 0.6 4区 数学
Tokyo Journal of Mathematics Pub Date : 2021-07-07 DOI: 10.3836/tjm/1502179379
Jianing Li
{"title":"On the $lambda$-invariant of Selmer Groups Arising from Certain Quadratic Twists of Gross Curves","authors":"Jianing Li","doi":"10.3836/tjm/1502179379","DOIUrl":"https://doi.org/10.3836/tjm/1502179379","url":null,"abstract":"Let q be a prime with q ≡ 7 mod 8, and let K = Q( √ −q). Then 2 splits in K, and we write p for either of the primes K above 2. Let K∞ be the unique Z2-extension of K unramified outside p with n-th layer Kn. For certain quadratic and biquadratic extensions F/K, we prove a simple exact formula for the λ-invariant of the Galois group of the maximal abelian 2-extension unramified outside p of the field F∞ = FK∞. Equivalently, our result determines the exact Z2-corank of certain Selmer groups over F∞ of a large family of quadratic twists of the higher dimensional abelian variety with complex multiplication, which is the restriction of scalars to K of the Gross curve with complex multiplication defined over the Hilbert class field of K. We also discuss computations of the associated Selmer groups over Kn in the case when the λ-invariant is equal to 1.","PeriodicalId":48976,"journal":{"name":"Tokyo Journal of Mathematics","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44368783","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: 1
A New Family of Latitudinally Corrugated Two-spheres of Revolution with Simple Cut Locus Structure 具有简单切割轨迹结构的一种新的纬向波纹双转球族
IF 0.6 4区 数学
Tokyo Journal of Mathematics Pub Date : 2021-06-08 DOI: 10.3836/tjm/1502179366
Minoru Tanaka, T. Akamatsu, R. Sinclair, M. Yamaguchi
{"title":"A New Family of Latitudinally Corrugated Two-spheres of Revolution with Simple Cut Locus Structure","authors":"Minoru Tanaka, T. Akamatsu, R. Sinclair, M. Yamaguchi","doi":"10.3836/tjm/1502179366","DOIUrl":"https://doi.org/10.3836/tjm/1502179366","url":null,"abstract":"There are not so many kinds of surface of revolution whose cut locus structure have been determined, although the cut locus structures of very familiar surfaces of revolution (in Euclidean space) such as ellipsoids, 2-sheeted hyperboloids, paraboloids and tori are now known. Except for tori, the known cut locus structures are very simple, i.e., a single point or an arc. In this article, a new family {Mn}n of 2-spheres of revolution with simple cut locus structure is introduced. This family is also new in the sense that the number of points on each meridian which assume a local minimum or maximum of the Gaussian curvature function on the meridian goes to infinity as n tends to infinity. Thus, our family includes surfaces which have arbitrarily many bands of alternately increasing or decreasing Gaussian curvature, although each member of this family has a simple cut locus structure.","PeriodicalId":48976,"journal":{"name":"Tokyo Journal of Mathematics","volume":"32 1-2","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41307926","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
On Syntomic Complexes with Modulus for Semi-stable Reduction Cases 半稳定还原情形下的模合原子配合物
IF 0.6 4区 数学
Tokyo Journal of Mathematics Pub Date : 2021-06-01 DOI: 10.3836/tjm/1502179342
Kento Yamamoto
{"title":"On Syntomic Complexes with Modulus for Semi-stable Reduction Cases","authors":"Kento Yamamoto","doi":"10.3836/tjm/1502179342","DOIUrl":"https://doi.org/10.3836/tjm/1502179342","url":null,"abstract":"In this paper, we define a syntomic complex for modulus pair $(X,D)$, where $X$ is a regular semi-stable family and $D$ is an effective Cartier divisor on $X$ and we compute its cohomology sheaves. We construct a symbol map for this syntomic complex for modulus pair $(X,D)$ and investigate its cokernel by computing its cohomology sheaves. To compute the structure of the cohomology sheaves of syntomic complex with modulus, we define some filtrations on it.","PeriodicalId":48976,"journal":{"name":"Tokyo Journal of Mathematics","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43028180","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
Computation of Some Leafwise Cohomology Ring 某些叶上同调环的计算
IF 0.6 4区 数学
Tokyo Journal of Mathematics Pub Date : 2021-03-11 DOI: 10.3836/tjm/1502179396
S. Mori
{"title":"Computation of Some Leafwise Cohomology Ring","authors":"S. Mori","doi":"10.3836/tjm/1502179396","DOIUrl":"https://doi.org/10.3836/tjm/1502179396","url":null,"abstract":"Let $G$ be the group $SL(2,mathbb{R})$, $Psubset G$ be the parabolic subgroup of upper triangular matrices and $Gammasubset G$ be a cocompact lattice. A right action of $P$ on $Gammabackslash G$ defines an orbit foliation $mathcal{F}_P$. We compute the leafwise cohomology ring $H^*(mathcal{F}_P)$ by exploiting non-abelian harmonic analysis on $G$.","PeriodicalId":48976,"journal":{"name":"Tokyo Journal of Mathematics","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48424965","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
A Multi-parameter Family of Self-avoiding Walks on the Sierpiński Gasket Sierpiński垫片上的多参数自回避行走族
IF 0.6 4区 数学
Tokyo Journal of Mathematics Pub Date : 2021-03-01 DOI: 10.3836/TJM/1502179338
T. Otsuka
{"title":"A Multi-parameter Family of Self-avoiding Walks on the\u0000 Sierpiński Gasket","authors":"T. Otsuka","doi":"10.3836/TJM/1502179338","DOIUrl":"https://doi.org/10.3836/TJM/1502179338","url":null,"abstract":"","PeriodicalId":48976,"journal":{"name":"Tokyo Journal of Mathematics","volume":"-1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48323683","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
Geometric Properties of Orbits of Hermann actions 赫尔曼作用轨道的几何性质
IF 0.6 4区 数学
Tokyo Journal of Mathematics Pub Date : 2021-01-04 DOI: 10.3836/tjm/1502179367
S. Ohno
{"title":"Geometric Properties of Orbits of Hermann actions","authors":"S. Ohno","doi":"10.3836/tjm/1502179367","DOIUrl":"https://doi.org/10.3836/tjm/1502179367","url":null,"abstract":"In this paper, we investigate properties of orbits of Hermann actions as submanifolds without assuming the commutability of involutions which define Hermann actions. In particular, we compute the second fundamental form of orbits of Hermann action, and give a sufficient condition for orbits of Hermann action to be weakly reflective (resp. arid) submanifolds.","PeriodicalId":48976,"journal":{"name":"Tokyo Journal of Mathematics","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43824839","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: 1
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信