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The Picard index of a surface with torus action 具有环作用的曲面的皮卡指数
IF 1.1 2区 数学
Collectanea Mathematica Pub Date : 2024-05-23 DOI: 10.1007/s13348-024-00443-x
Justus Springer
{"title":"The Picard index of a surface with torus action","authors":"Justus Springer","doi":"10.1007/s13348-024-00443-x","DOIUrl":"https://doi.org/10.1007/s13348-024-00443-x","url":null,"abstract":"<p>We consider normal rational projective surfaces with torus action and provide a formula for their Picard index, that means the index of the Picard group inside the divisor class group. As an application, we classify the log del Pezzo surfaces with torus action of Picard number one up to Picard index <span>( 10,000 )</span>.</p>","PeriodicalId":50993,"journal":{"name":"Collectanea Mathematica","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141150995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Gaussian maps for singular curves on Enriques surfaces 恩里克曲面上奇异曲线的高斯映射
IF 1.1 2区 数学
Collectanea Mathematica Pub Date : 2024-04-30 DOI: 10.1007/s13348-024-00442-y
Dario Faro
{"title":"Gaussian maps for singular curves on Enriques surfaces","authors":"Dario Faro","doi":"10.1007/s13348-024-00442-y","DOIUrl":"https://doi.org/10.1007/s13348-024-00442-y","url":null,"abstract":"<p>A marked Prym curve is a triple <span>((C,alpha ,T_d))</span> where <i>C</i> is a smooth algebraic curve, <span>(alpha )</span> is a <span>(2-)</span>torsion line bundle on <i>C</i>, and <span>(T_d)</span> is a divisor of degree <i>d</i>. We give obstructions—in terms of Gaussian maps—for a marked Prym curve <span>((C,alpha ,T_d))</span> to admit a singular model lying on an Enriques surface with only one ordinary singular point of multiplicity <i>d</i>, such that <span>(T_d)</span> is the pull-back of the singular point by the normalization map. More precisely, let (<i>S</i>, <i>H</i>) be a polarized Enriques surface and let (<i>C</i>, <i>f</i>) be a smooth curve together with a morphism <span>(f:C rightarrow S)</span> birational onto its image and such that <span>(f(C) in |H|)</span>, <i>f</i>(<i>C</i>) has exactly one ordinary singular point of multiplicity <i>d</i>. Let <span>(alpha =f^*omega _S)</span> and <span>(T_d)</span> be the divisor over the singular point of <i>f</i>(<i>C</i>). We show that if <i>H</i> is sufficiently positive then certain natural Gaussian maps on <i>C</i>, associated with <span>(omega _C)</span>, <span>(alpha )</span>, and <span>(T_d)</span> are not surjective. On the contrary, we show that for the general triple in the moduli space of marked Prym curves <span>((C,alpha ,T_d))</span>, the same Gaussian maps are surjective.</p>","PeriodicalId":50993,"journal":{"name":"Collectanea Mathematica","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140835585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Simon conjecture and the $$text{ v }$$-number of monomial ideals 西蒙猜想与单项式理想的 $$text{ v }$$ 数
IF 1.1 2区 数学
Collectanea Mathematica Pub Date : 2024-04-23 DOI: 10.1007/s13348-024-00441-z
Antonino Ficarra
{"title":"Simon conjecture and the $$text{ v }$$-number of monomial ideals","authors":"Antonino Ficarra","doi":"10.1007/s13348-024-00441-z","DOIUrl":"https://doi.org/10.1007/s13348-024-00441-z","url":null,"abstract":"","PeriodicalId":50993,"journal":{"name":"Collectanea Mathematica","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140670259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 Rees algebras of linearly presented ideals and modules 论线性呈现的理想和模块的里斯代数
IF 1.1 2区 数学
Collectanea Mathematica Pub Date : 2024-04-04 DOI: 10.1007/s13348-024-00440-0
{"title":"On Rees algebras of linearly presented ideals and modules","authors":"","doi":"10.1007/s13348-024-00440-0","DOIUrl":"https://doi.org/10.1007/s13348-024-00440-0","url":null,"abstract":"<h3>Abstract</h3> <p>Let <em>I</em> be a perfect ideal of height two in <span> <span>(R=k[x_1, ldots , x_d])</span> </span> and let <span> <span>(varphi )</span> </span> denote its Hilbert–Burch matrix. When <span> <span>(varphi )</span> </span> has linear entries, the algebraic structure of the Rees algebra <span> <span>({mathcal {R}}(I))</span> </span> is well-understood under the additional assumption that the minimal number of generators of <em>I</em> is bounded locally up to codimension <span> <span>(d-1)</span> </span>. In the first part of this article, we determine the defining ideal of <span> <span>({mathcal {R}}(I))</span> </span> under the weaker assumption that such condition holds only up to codimension <span> <span>(d-2)</span> </span>, generalizing previous work of P. H. L. Nguyen. In the second part, we use generic Bourbaki ideals to extend our findings to Rees algebras of linearly presented modules of projective dimension one. </p>","PeriodicalId":50993,"journal":{"name":"Collectanea Mathematica","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140598730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
K-flatness in Grothendieck categories: application to quasi-coherent sheaves 格罗内迪克范畴中的 K 平性：准相干剪切的应用
IF 1.1 2区 数学
Collectanea Mathematica Pub Date : 2024-04-03 DOI: 10.1007/s13348-024-00439-7
Sergio Estrada, James Gillespie, Sinem Odabaşi
{"title":"K-flatness in Grothendieck categories: application to quasi-coherent sheaves","authors":"Sergio Estrada, James Gillespie, Sinem Odabaşi","doi":"10.1007/s13348-024-00439-7","DOIUrl":"https://doi.org/10.1007/s13348-024-00439-7","url":null,"abstract":"<p>Let <span>((mathcal {G},otimes ))</span> be any closed symmetric monoidal Grothendieck category. We show that K-flat covers exist universally in the category of chain complexes and that the Verdier quotient of <span>(K(mathcal {G}))</span> by the K-flat complexes is always a well generated triangulated category. Under the further assumption that <span>(mathcal {G})</span> has a set of <span>(otimes)</span>-flat generators we can show more: (i) The category is in recollement with the <span>(otimes)</span>-pure derived category and the usual derived category, and (ii) The usual derived category is the homotopy category of a cofibrantly generated and monoidal model structure whose cofibrant objects are precisely the K-flat complexes. We also give a condition guaranteeing that the right orthogonal to K-flat is precisely the acyclic complexes of <span>(otimes)</span>-pure injectives. We show this condition holds for quasi-coherent sheaves over a quasi-compact and semiseparated scheme.</p>","PeriodicalId":50993,"journal":{"name":"Collectanea Mathematica","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140599222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Kato–Ponce inequality with $$A_{vec P}$$ weights 带有 $$A_{vec P}$ 权重的卡托-庞斯不等式
IF 1.1 2区 数学
Collectanea Mathematica Pub Date : 2024-03-25 DOI: 10.1007/s13348-024-00434-y
Sean Douglas
{"title":"Kato–Ponce inequality with $$A_{vec P}$$ weights","authors":"Sean Douglas","doi":"10.1007/s13348-024-00434-y","DOIUrl":"https://doi.org/10.1007/s13348-024-00434-y","url":null,"abstract":"<p>We prove the Kato–Ponce inequality (fractional normed Leibniz rule) for multiple factors in the setting of <i>multiple weights</i> (<span>(A_{vec P})</span> weights). This improves existing results to the product of <i>m</i> factors and extends the class of known weights for which the inequality holds.</p>","PeriodicalId":50993,"journal":{"name":"Collectanea Mathematica","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140297622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Maximal function characterization of Hardy spaces related to Laguerre polynomial expansions 与拉盖尔多项式展开相关的哈代空间的最大函数表征
IF 1.1 2区 数学
Collectanea Mathematica Pub Date : 2024-03-19 DOI: 10.1007/s13348-024-00433-z
Jorge J. Betancor, Estefanía Dalmasso, Pablo Quijano, Roberto Scotto
{"title":"Maximal function characterization of Hardy spaces related to Laguerre polynomial expansions","authors":"Jorge J. Betancor, Estefanía Dalmasso, Pablo Quijano, Roberto Scotto","doi":"10.1007/s13348-024-00433-z","DOIUrl":"https://doi.org/10.1007/s13348-024-00433-z","url":null,"abstract":"<p>In this paper we introduce the atomic Hardy space <span>(mathcal {H}^1((0,infty ),gamma _alpha ))</span> associated with the non-doubling probability measure <span>(dgamma _alpha (x)=frac{2x^{2alpha +1}}{Gamma (alpha +1)}e^{-x^2}dx)</span> on <span>((0,infty ))</span>, for <span>({alpha &gt;-frac{1}{2}})</span>. We obtain characterizations of <span>(mathcal {H}^1((0,infty ),gamma _alpha ))</span> by using two local maximal functions. We also prove that the truncated maximal function defined through the heat semigroup generated by the Laguerre differential operator is bounded from <span>(mathcal {H}^1((0,infty ),gamma _alpha ))</span> into <span>(L^1((0,infty ),gamma _alpha ))</span>.</p>","PeriodicalId":50993,"journal":{"name":"Collectanea Mathematica","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140168219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Connecting ideals in evolution algebras with hereditary subsets of its associated graph 将演化代数中的理想与相关图的遗传子集联系起来
IF 1.1 2区 数学
Collectanea Mathematica Pub Date : 2024-03-14 DOI: 10.1007/s13348-024-00435-x
Yolanda Cabrera Casado, Dolores Martín Barquero, Cándido Martín González, Alicia Tocino
{"title":"Connecting ideals in evolution algebras with hereditary subsets of its associated graph","authors":"Yolanda Cabrera Casado, Dolores Martín Barquero, Cándido Martín González, Alicia Tocino","doi":"10.1007/s13348-024-00435-x","DOIUrl":"https://doi.org/10.1007/s13348-024-00435-x","url":null,"abstract":"<p>In this article, we introduce a relation including ideals of an evolution algebra <i>A</i> and hereditary subsets of vertices of its associated graph and establish some properties among them. This relation allows us to determine maximal ideals and ideals having the absorption property of an evolution algebra in terms of its associated graph. In particular, the maximal ideals can be determined through maximal hereditary subsets of vertices except for those containing <span>(A^2)</span>. We also define a couple of order-preserving maps, one from the sets of ideals of an evolution algebra to that of hereditary subsets of the corresponding graph, and the other in the reverse direction. Conveniently restricted to the set of absorption ideals and to the set of hereditary saturated subsets, this is a monotone Galois connection. According to the graph, we characterize arbitrary dimensional finitely-generated (as algebras) evolution algebras under certain restrictions of its graph. Furthermore, the simplicity of finitely-generated perfect evolution algebras is described on the basis of the simplicity of the graph.</p>","PeriodicalId":50993,"journal":{"name":"Collectanea Mathematica","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140128832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Commuting Toeplitz and small Hankel operators on the Bergman space 伯格曼空间上的共通托普利兹和小汉克尔算子
IF 1.1 2区 数学
Collectanea Mathematica Pub Date : 2024-03-14 DOI: 10.1007/s13348-024-00438-8
Jiawei Wang, Jie Zhang, Xianfeng Zhao
{"title":"Commuting Toeplitz and small Hankel operators on the Bergman space","authors":"Jiawei Wang, Jie Zhang, Xianfeng Zhao","doi":"10.1007/s13348-024-00438-8","DOIUrl":"https://doi.org/10.1007/s13348-024-00438-8","url":null,"abstract":"<p>This paper shows that on the Bergman space of the open unit disk, the Toeplitz operator <span>(T_{{overline{p}}+varphi })</span> and the small Hankel operator <span>(Gamma _psi)</span> commute only in the obvious cases, where <span>(varphi)</span> and <span>(psi)</span> are both bounded analytic functions, and <i>p</i> is an analytic polynomial.</p>","PeriodicalId":50993,"journal":{"name":"Collectanea Mathematica","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140155008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Generalized Cesàro operators in weighted Banach spaces of analytic functions with sup-norms 加权巴拿赫解析函数超规范空间中的广义塞萨罗算子
IF 1.1 2区 数学
Collectanea Mathematica Pub Date : 2024-03-12 DOI: 10.1007/s13348-024-00437-9
{"title":"Generalized Cesàro operators in weighted Banach spaces of analytic functions with sup-norms","authors":"","doi":"10.1007/s13348-024-00437-9","DOIUrl":"https://doi.org/10.1007/s13348-024-00437-9","url":null,"abstract":"<h3>Abstract</h3> <p>An investigation is made of the generalized Cesàro operators <span> <span>(C_t)</span> </span>, for <span> <span>(tin [0,1])</span> </span>, when they act on the space <span> <span>(H({{mathbb {D}}}))</span> </span> of holomorphic functions on the open unit disc <span> <span>({{mathbb {D}}})</span> </span>, on the Banach space <span> <span>(H^infty )</span> </span> of bounded analytic functions and on the weighted Banach spaces <span> <span>(H_v^infty )</span> </span> and <span> <span>(H_v^0)</span> </span> with their sup-norms. Of particular interest are the continuity, compactness, spectrum and point spectrum of <span> <span>(C_t)</span> </span> as well as their linear dynamics and mean ergodicity. </p>","PeriodicalId":50993,"journal":{"name":"Collectanea Mathematica","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140129169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
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