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Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg最新文献

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Forms and currents defining generalized p-Kähler structures 定义广义p-Kähler结构的形式和电流
IF 0.4 4区 数学
Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg Pub Date : 2018-03-29 DOI: 10.1007/s12188-018-0193-x
Lucia Alessandrini
{"title":"Forms and currents defining generalized p-Kähler structures","authors":"Lucia Alessandrini","doi":"10.1007/s12188-018-0193-x","DOIUrl":"10.1007/s12188-018-0193-x","url":null,"abstract":"<div><p>This paper is devoted, first of all, to give a complete unified proof of the characterization theorem for compact generalized Kähler manifolds. The proof is based on the classical duality between “closed” positive forms and “exact” positive currents. In the last part of the paper we approach the general case of non compact complex manifolds, where “exact” positive forms seem to play a more significant role than “closed” forms. In this setting, we state the appropriate characterization theorems and give some interesting applications.</p></div>","PeriodicalId":50932,"journal":{"name":"Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg","volume":"88 1","pages":"217 - 245"},"PeriodicalIF":0.4,"publicationDate":"2018-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s12188-018-0193-x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50053399","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
Correction to: Split buildings of type (mathsf {F_4}) in buildings of type (mathsf {E_6}) 修正:在类型的建筑物中拆分类型为(mathsf {F_4})的建筑物 (mathsf {E_6})
IF 0.4 4区 数学
Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg Pub Date : 2018-02-09 DOI: 10.1007/s12188-018-0192-y
Anneleen De Schepper, N. S. Narasimha Sastry, Hendrik Van Maldeghem
{"title":"Correction to: Split buildings of type (mathsf {F_4}) in buildings of type (mathsf {E_6})","authors":"Anneleen De Schepper,&nbsp;N. S. Narasimha Sastry,&nbsp;Hendrik Van Maldeghem","doi":"10.1007/s12188-018-0192-y","DOIUrl":"10.1007/s12188-018-0192-y","url":null,"abstract":"","PeriodicalId":50932,"journal":{"name":"Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg","volume":"88 1","pages":"161 - 161"},"PeriodicalIF":0.4,"publicationDate":"2018-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s12188-018-0192-y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50034103","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
Asymptotic analysis of expectations of plane partition statistics 平面划分统计量期望的渐近分析
IF 0.4 4区 数学
Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg Pub Date : 2018-02-06 DOI: 10.1007/s12188-018-0191-z
Ljuben Mutafchiev
{"title":"Asymptotic analysis of expectations of plane partition statistics","authors":"Ljuben Mutafchiev","doi":"10.1007/s12188-018-0191-z","DOIUrl":"10.1007/s12188-018-0191-z","url":null,"abstract":"<div><p>Assuming that a plane partition of the positive integer <i>n</i> is chosen uniformly at random from the set of all such partitions, we propose a general asymptotic scheme for the computation of expectations of various plane partition statistics as <i>n</i> becomes large. The generating functions that arise in this study are of the form <i>Q</i>(<i>x</i>)<i>F</i>(<i>x</i>), where <span>(Q(x)=prod _{j=1}^infty (1-x^j)^{-j})</span> is the generating function for the number of plane partitions. We show how asymptotics of such expectations can be obtained directly from the asymptotic expansion of the function <i>F</i>(<i>x</i>) around <span>(x=1)</span>. The representation of a plane partition as a solid diagram of volume <i>n</i> allows interpretations of these statistics in terms of its dimensions and shape. As an application of our main result, we obtain the asymptotic behavior of the expected values of the largest part, the number of columns, the number of rows (that is, the three dimensions of the solid diagram) and the trace (the number of cubes in the wall on the main diagonal of the solid diagram). Our results are similar to those of Grabner et al. (Comb Probab Comput 23:1057–1086, 2014) related to linear integer partition statistics. We base our study on the Hayman’s method for admissible power series.</p></div>","PeriodicalId":50932,"journal":{"name":"Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg","volume":"88 1","pages":"255 - 272"},"PeriodicalIF":0.4,"publicationDate":"2018-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s12188-018-0191-z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50010888","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: 3
Split buildings of type (mathsf {F_4}) in buildings of type (mathsf {E_6}) 在类型的建筑物中拆分类型为(mathsf {F_4})的建筑物 (mathsf {E_6})
IF 0.4 4区 数学
Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg Pub Date : 2018-01-16 DOI: 10.1007/s12188-017-0190-5
Anneleen De Schepper, N. S. Narasimha Sastry, Hendrik Van Maldeghem
{"title":"Split buildings of type (mathsf {F_4}) in buildings of type (mathsf {E_6})","authors":"Anneleen De Schepper,&nbsp;N. S. Narasimha Sastry,&nbsp;Hendrik Van Maldeghem","doi":"10.1007/s12188-017-0190-5","DOIUrl":"10.1007/s12188-017-0190-5","url":null,"abstract":"<div><p>A symplectic polarity of a building <span>(varDelta )</span> of type <span>(mathsf {E_6})</span> is a polarity whose fixed point structure is a building of type <span>(mathsf {F_4})</span> containing residues isomorphic to symplectic polar spaces (i.e., so-called <i>split buildings</i> of type <span>(mathsf {F_4})</span>). In this paper, we show in a geometric way that every building of type <span>(mathsf {E_6})</span> contains, up to conjugacy, a unique class of symplectic polarities. We also show that the natural point-line geometry of each split building of type <span>(mathsf {F_4})</span> fully embedded in the natural point-line geometry of <span>(varDelta )</span> arises from a symplectic polarity.</p></div>","PeriodicalId":50932,"journal":{"name":"Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg","volume":"88 1","pages":"97 - 160"},"PeriodicalIF":0.4,"publicationDate":"2018-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s12188-017-0190-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50032407","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: 3
Why there is no an existence theorem for a convex polytope with prescribed directions and perimeters of the faces? 为什么没有一个凸多面体的存在性定理，它的面有规定的方向和周长?
IF 0.4 4区 数学
Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg Pub Date : 2017-12-11 DOI: 10.1007/s12188-017-0189-y
Victor Alexandrov
{"title":"Why there is no an existence theorem for a convex polytope with prescribed directions and perimeters of the faces?","authors":"Victor Alexandrov","doi":"10.1007/s12188-017-0189-y","DOIUrl":"10.1007/s12188-017-0189-y","url":null,"abstract":"<div><p>We choose some special unit vectors <span>({mathbf {n}}_1,ldots ,{mathbf {n}}_5)</span> in <span>({mathbb {R}}^3)</span> and denote by <span>({mathscr {L}}subset {mathbb {R}}^5)</span> the set of all points <span>((L_1,ldots ,L_5)in {mathbb {R}}^5)</span> with the following property: there exists a compact convex polytope <span>(Psubset {mathbb {R}}^3)</span> such that the vectors <span>({mathbf {n}}_1,ldots ,{mathbf {n}}_5)</span> (and no other vector) are unit outward normals to the faces of <i>P</i> and the perimeter of the face with the outward normal <span>({mathbf {n}}_k)</span> is equal to <span>(L_k)</span> for all <span>(k=1,ldots ,5)</span>. Our main result reads that <span>({mathscr {L}})</span> is not a locally-analytic set, i.e., we prove that, for some point <span>((L_1,ldots ,L_5)in {mathscr {L}})</span>, it is not possible to find a neighborhood <span>(Usubset {mathbb {R}}^5)</span> and an analytic set <span>(Asubset {mathbb {R}}^5)</span> such that <span>({mathscr {L}}cap U=Acap U)</span>. We interpret this result as an obstacle for finding an existence theorem for a compact convex polytope with prescribed directions and perimeters of the faces.</p></div>","PeriodicalId":50932,"journal":{"name":"Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg","volume":"88 1","pages":"247 - 254"},"PeriodicalIF":0.4,"publicationDate":"2017-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s12188-017-0189-y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50040280","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
Seifert fibrations of lens spaces 晶状体间隙的塞弗特颤动
IF 0.4 4区 数学
Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg Pub Date : 2017-10-23 DOI: 10.1007/s12188-017-0188-z
Hansjörg Geiges, Christian Lange
{"title":"Seifert fibrations of lens spaces","authors":"Hansjörg Geiges,&nbsp;Christian Lange","doi":"10.1007/s12188-017-0188-z","DOIUrl":"10.1007/s12188-017-0188-z","url":null,"abstract":"<div><p>We classify the Seifert fibrations of any given lens space <i>L</i>(<i>p</i>, <i>q</i>). Starting from any pair of coprime non-zero integers <span>(alpha _1^0,alpha _2^0)</span>, we give an algorithmic construction of a Seifert fibration <span>(L(p,q)rightarrow S^2(alpha |alpha _1^0|,alpha |alpha _2^0|))</span>, where the natural number <span>(alpha )</span> is determined by the algorithm. This algorithm produces all possible Seifert fibrations, and the isomorphisms between the resulting Seifert fibrations are described completely. Also, we show that all Seifert fibrations are isomorphic to certain standard models.</p></div>","PeriodicalId":50932,"journal":{"name":"Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg","volume":"88 1","pages":"1 - 22"},"PeriodicalIF":0.4,"publicationDate":"2017-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s12188-017-0188-z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50045088","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: 31
On Ikehara type Tauberian theorems with (O(x^gamma )) remainders 关于带(O(x^gamma ))余数的池原型陶伯利定理
IF 0.4 4区 数学
Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg Pub Date : 2017-09-12 DOI: 10.1007/s12188-017-0187-0
Michael Müger
{"title":"On Ikehara type Tauberian theorems with (O(x^gamma )) remainders","authors":"Michael Müger","doi":"10.1007/s12188-017-0187-0","DOIUrl":"10.1007/s12188-017-0187-0","url":null,"abstract":"<div><p>Motivated by analytic number theory, we explore remainder versions of Ikehara’s Tauberian theorem yielding power law remainder terms. More precisely, for <span>(f:[1,infty )rightarrow {mathbb R})</span> non-negative and non-decreasing we prove <span>(f(x)-x=O(x^gamma ))</span> with <span>(gamma &lt;1)</span> under certain assumptions on <i>f</i>. We state a conjecture concerning the weakest natural assumptions and show that we cannot hope for more.</p></div>","PeriodicalId":50932,"journal":{"name":"Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg","volume":"88 1","pages":"209 - 216"},"PeriodicalIF":0.4,"publicationDate":"2017-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s12188-017-0187-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50022530","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: 3
Triviality of Iwasawa module associated to some abelian fields of prime conductors 与一些素数导体阿贝尔场相关的Iwasawa模的平凡性
IF 0.4 4区 数学
Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg Pub Date : 2017-09-11 DOI: 10.1007/s12188-017-0186-1
Humio Ichimura
{"title":"Triviality of Iwasawa module associated to some abelian fields of prime conductors","authors":"Humio Ichimura","doi":"10.1007/s12188-017-0186-1","DOIUrl":"10.1007/s12188-017-0186-1","url":null,"abstract":"<div><p>Let <i>p</i> be an odd prime number and <span>(ell )</span> an odd prime number dividing <span>(p-1)</span>. We denote by <span>(F=F_{p,ell })</span> the real abelian field of conductor <i>p</i> and degree <span>(ell )</span>, and by <span>(h_F)</span> the class number of <i>F</i>. For a prime number <span>(r ne p,,ell )</span>, let <span>(F_{infty })</span> be the cyclotomic <span>(mathbb {Z}_r)</span>-extension over <i>F</i>, and <span>(M_{infty }/F_{infty })</span> the maximal pro-<i>r</i> abelian extension unramified outside <i>r</i>. We prove that <span>(M_{infty })</span> coincides with <span>(F_{infty })</span> and consequently <span>(h_F)</span> is not divisible by <i>r</i> when <i>r</i> is a primitive root modulo <span>(ell )</span> and <i>r</i> is smaller than an explicit constant depending on <i>p</i>.</p></div>","PeriodicalId":50932,"journal":{"name":"Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg","volume":"88 1","pages":"51 - 66"},"PeriodicalIF":0.4,"publicationDate":"2017-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s12188-017-0186-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50020415","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: 6
Isospectral nearly Kähler manifolds 等光谱近似Kähler流形
IF 0.4 4区 数学
Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg Pub Date : 2017-08-22 DOI: 10.1007/s12188-017-0185-2
J. J. Vásquez
{"title":"Isospectral nearly Kähler manifolds","authors":"J. J. Vásquez","doi":"10.1007/s12188-017-0185-2","DOIUrl":"10.1007/s12188-017-0185-2","url":null,"abstract":"<div><p>We give a systematic way to construct almost conjugate pairs of finite subgroups of <span>(mathrm {Spin}(2n+1))</span> and <span>({{mathrm{Pin}}}(n))</span> for <span>(nin {mathbb {N}})</span> sufficiently large. As a geometric application, we give an infinite family of pairs <span>(M_1^{d_n})</span> and <span>(M_2^{d_n})</span> of nearly Kähler manifolds that are isospectral for the Dirac and Laplace operator with increasing dimensions <span>(d_n&gt;6)</span>. We provide additionally a computation of the volume of (locally) homogeneous six dimensional nearly Kähler manifolds and investigate the existence of Sunada pairs in this dimension.</p></div>","PeriodicalId":50932,"journal":{"name":"Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg","volume":"88 1","pages":"23 - 50"},"PeriodicalIF":0.4,"publicationDate":"2017-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s12188-017-0185-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50041800","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
Theta functions on tube domains 在管域上的函数
IF 0.4 4区 数学
Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg Pub Date : 2017-06-28 DOI: 10.1007/s12188-017-0184-3
Josef F. Dorfmeister, Sebastian Walcher
{"title":"Theta functions on tube domains","authors":"Josef F. Dorfmeister,&nbsp;Sebastian Walcher","doi":"10.1007/s12188-017-0184-3","DOIUrl":"10.1007/s12188-017-0184-3","url":null,"abstract":"<div><p>We discuss generalizations of classical theta series, requiring only some basic properties of the classical setting. As it turns out, the existence of a generalized theta transformation formula implies that the series is defined over a quasi-symmetric Siegel domain. In particular the exceptional symmetric tube domain does not admit a theta function.</p></div>","PeriodicalId":50932,"journal":{"name":"Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg","volume":"88 2","pages":"273 - 288"},"PeriodicalIF":0.4,"publicationDate":"2017-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s12188-017-0184-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50051243","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
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