{"title":"Maximal minors of 1-generic matrices have rational singularities","authors":"Trung Chau, Manoj Kummini","doi":"10.1007/s00013-025-02202-1","DOIUrl":"10.1007/s00013-025-02202-1","url":null,"abstract":"<div><p>We show that the quotient ring by the ideal of maximal minors of a 1-generic matrix has rational singularities. This answers a conjecture of Eisenbud (Amer J Math 110(3):541–575, 1988) that such rings are normal, and generalizes a result of Conca et al. (Adv Math 335:111–129, 2018) that generic Hankel determinantal rings have rational singularities in characteristic zero.</p></div>","PeriodicalId":8346,"journal":{"name":"Archiv der Mathematik","volume":"126 3","pages":"267 - 274"},"PeriodicalIF":0.5,"publicationDate":"2025-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147341910","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}
{"title":"Integrability of Kepler billiards at zero-energy","authors":"Lei Zhao","doi":"10.1007/s00013-025-02204-z","DOIUrl":"10.1007/s00013-025-02204-z","url":null,"abstract":"<div><p>We consider a Kepler billiard with zero-energy in the plane defined inside a smooth closed connected simple curve which intersects all focused parabola at at most two points. We show that if it has an invariant curve consisting of 2-periodic orbits and there exists a <span>(C^{1})</span>-first integral with non-vanishing gradient in the region between the invariant curve and the boundary curve, then the system is defined actually inside an ellipse with the Kepler center occupying one of the foci. This statement is obtained as a simple “translation” of the theorem of Bialy–Mironov [3] with Levi–Civita transformation.</p></div>","PeriodicalId":8346,"journal":{"name":"Archiv der Mathematik","volume":"126 3","pages":"329 - 333"},"PeriodicalIF":0.5,"publicationDate":"2025-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147341681","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}
{"title":"A matrix differential Harnack estimate for a class of hypoelliptic evolution equations","authors":"Bin Qian, Beibei Zhang","doi":"10.1007/s00013-025-02197-9","DOIUrl":"10.1007/s00013-025-02197-9","url":null,"abstract":"<div><p>In this paper, we derive a matrix differential Harnack estimate for a class of hypoelliptic evolution equations satisfying the Hörmander condition, which solves the second conjecture in the paper by Huang (Potent Anal 41(3):771–782, 2014).</p></div>","PeriodicalId":8346,"journal":{"name":"Archiv der Mathematik","volume":"126 2","pages":"199 - 207"},"PeriodicalIF":0.5,"publicationDate":"2025-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340886","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}
{"title":"Decompositions of Scherk-type zero mean curvature surfaces","authors":"Subham Paul, Priyank Vasu, Siddharth Panigrahi, Rahul Kumar Singh","doi":"10.1007/s00013-025-02196-w","DOIUrl":"10.1007/s00013-025-02196-w","url":null,"abstract":"<div><p>In this paper, by using a special Euler–Ramanujan identity and the idea of Wick rotation, we show that a one-parameter family of solutions to the zero mean curvature equation in the Lorentz–Minkowski 3-space <span>(mathbb {E}_1^3)</span>, namely Scherk-type zero mean curvature surfaces, can be expressed as an infinite superposition of dilated helicoids. Further, we also obtain different finite decompositions for these surfaces. We end this paper with an application of these decompositions to formulate maximal codimension 2 surfaces into finite and infinite “sums” of weakly untrapped and <span>(*)</span>-surfaces in the Lorentz–Minkowski 4-space.</p></div>","PeriodicalId":8346,"journal":{"name":"Archiv der Mathematik","volume":"126 1","pages":"107 - 120"},"PeriodicalIF":0.5,"publicationDate":"2025-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145969464","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}
{"title":"Gradient estimates for a class of p-Laplacian equations","authors":"Guangyue Huang, Jingxu Liu, Zhen Wang","doi":"10.1007/s00013-025-02192-0","DOIUrl":"10.1007/s00013-025-02192-0","url":null,"abstract":"<div><p>By virtue of the Nash–Moser iteration, we obtain a local gradient estimate of positive weak solutions to the weighted <i>p</i>-Laplacian equation </p><div><div><span>$$begin{aligned} Delta _{p,f}u+a(x)uln u=0 end{aligned}$$</span></div></div><p>defined on a complete smooth metric measure space under the condition that the <i>m</i>-Bakry–Émery Ricci curvature has a lower bound, where <span>(p>2)</span> and the function <span>(a(x)le 0.)</span> As applications, Liouville-type theorems for positive solutions to the above equation are achieved.</p></div>","PeriodicalId":8346,"journal":{"name":"Archiv der Mathematik","volume":"126 1","pages":"71 - 85"},"PeriodicalIF":0.5,"publicationDate":"2025-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145969478","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}
{"title":"On simplicial complexes with maximal total bigraded Betti number","authors":"Pimeng Dai, Li Yu","doi":"10.1007/s00013-025-02195-x","DOIUrl":"10.1007/s00013-025-02195-x","url":null,"abstract":"<div><p>We determine which simplicial complexes with a given number of vertices have the maximum sum of bigraded Betti numbers.</p></div>","PeriodicalId":8346,"journal":{"name":"Archiv der Mathematik","volume":"126 1","pages":"41 - 51"},"PeriodicalIF":0.5,"publicationDate":"2025-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145969476","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}
{"title":"A generating set for the Johnson kernel","authors":"Marco Boggi","doi":"10.1007/s00013-025-02190-2","DOIUrl":"10.1007/s00013-025-02190-2","url":null,"abstract":"<div><p>For a connected orientable hyperbolic surface <i>S</i> without boundary and of finite topological type, the Johnson kernel <span>(mathcal {K}(S))</span> is the subgroup of the mapping class group of <i>S</i> generated by Dehn twists about separating simple closed curves on <i>S</i>. We prove that <span>(mathcal {K}(S))</span> is generated by the Dehn twists about separating simple closed curves on <i>S</i> bounding either: a closed subsurface of genus 1 or 2; a closed subsurface of genus 1 minus one point; a closed disc minus two points.</p></div>","PeriodicalId":8346,"journal":{"name":"Archiv der Mathematik","volume":"126 1","pages":"13 - 20"},"PeriodicalIF":0.5,"publicationDate":"2025-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145969475","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}
{"title":"Correction to: McKay bijections and decomposition numbers","authors":"David Cabrera-Berenguer","doi":"10.1007/s00013-025-02191-1","DOIUrl":"10.1007/s00013-025-02191-1","url":null,"abstract":"","PeriodicalId":8346,"journal":{"name":"Archiv der Mathematik","volume":"125 6","pages":"587 - 587"},"PeriodicalIF":0.5,"publicationDate":"2025-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145486577","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}
{"title":"A note on the critical values of symmetric square L-functions","authors":"Tianyu Ni","doi":"10.1007/s00013-025-02186-y","DOIUrl":"10.1007/s00013-025-02186-y","url":null,"abstract":"<div><p>For even <span>(kge 6)</span> and square free <span>(D>1)</span> with <span>(Dequiv 1pmod 4)</span>, let <span>(chi _D)</span> be the primitive quadratic Dirichlet character mod <i>D</i> and <span>(S_k(D,chi _D))</span> be the space of cusp forms of weight <i>k</i>, level <i>D</i>, and nebentypus <span>(chi _D)</span>. We show that if <span>(D>2^{k-2})</span>, then the critical values of symmetric square <i>L</i>-functions on <span>(S_k(D,chi _D))</span> are linearly independent.</p></div>","PeriodicalId":8346,"journal":{"name":"Archiv der Mathematik","volume":"126 1","pages":"53 - 60"},"PeriodicalIF":0.5,"publicationDate":"2025-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145969473","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}
{"title":"Coprime action and principal blocks","authors":"Zhicheng Feng, Carolina Vallejo","doi":"10.1007/s00013-025-02189-9","DOIUrl":"10.1007/s00013-025-02189-9","url":null,"abstract":"<div><p>In the situation where a finite group <i>A</i> acts coprimely by automorphisms on another finite group <i>G</i>, we characterize when the principal <i>p</i>-block of <i>G</i> contains a unique <i>A</i>-invariant irreducible character, in terms of the subgroup <span>(textbf{C}_{G}(A))</span> of fixed points under such action.</p></div>","PeriodicalId":8346,"journal":{"name":"Archiv der Mathematik","volume":"126 1","pages":"3 - 12"},"PeriodicalIF":0.5,"publicationDate":"2025-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00013-025-02189-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145969463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}