Annali dell''Universita di Ferrara最新文献_第4页

On balancing and Lucas-balancing numbers expressible as product of two k-Fibonacci numbers 关于可表示为两个k-斐波那契数积的平衡数和卢卡斯平衡数

Annali dell''Universita di Ferrara Pub Date : 2026-09-08 DOI: 10.1007/s11565-026-00742-0

Bibhu Prasad Tripathy, Bijan Kumar Patel

引用次数: 0

Special affine graph transforms and commutator defects of position-decorated graph laplacians 位置装饰图拉普拉斯算子的特殊仿射图变换和换向子缺陷

Annali dell''Universita di Ferrara Pub Date : 2026-09-08 DOI: 10.1007/s11565-026-00751-z

Owais Ahmad

{"title":"Special affine graph transforms and commutator defects of position-decorated graph laplacians","authors":"Owais Ahmad","doi":"10.1007/s11565-026-00751-z","DOIUrl":"10.1007/s11565-026-00751-z","url":null,"abstract":"<div><p>A finite-dimensional theory of special-affine transforms is developed for position-decorated spectral graphs. A Hermitian graph Laplacian generates a normalized frequency observable, while a normalized diagonal decoration supplies the position observable. Their ordered exponentials define graph Weyl operators, which are coupled to Iwasawa and three-shear graph linear-canonical factors. The resulting transforms are unitary and covariant under decorated graph isomorphisms, including monomial gauge-permutation equivalence for Hermitian directed Laplacians. The commutator generator is proved to be Hilbert–Schmidt orthogonal to the Laplacian commutant, yielding an exact defect formula and a weighted-Laplacian eigenproblem for selecting the position decoration. Quantitative Baker–Campbell–Hausdorff estimates control local Weyl, Egorov, homogeneous, and full special-affine composition errors. For odd-prime cycles, quantized exponentials of centered position and momentum matrices recover the clock-shift system and its exact finite Weil covariance. Frame criteria, canonical Parseval preconditioning, and a reproducible sensor-graph experiment quantify reconstruction accuracy, noise amplification, conditioning trade-offs, and factorization dependence. The theory therefore connects finite operator obstructions with computable graph-transform design.</p></div>","PeriodicalId":35009,"journal":{"name":"Annali dell''Universita di Ferrara","volume":"72 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148903383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Interpolating the power mean Inequalities for Positive Definite and Sectorial Matrices 插值正定矩阵和扇形矩阵的幂均值不等式

Annali dell''Universita di Ferrara Pub Date : 2026-09-08 DOI: 10.1007/s11565-026-00679-4

H. Mohammadzadehkan, S. Malekinejad, M. Sababheh

{"title":"Interpolating the power mean Inequalities for Positive Definite and Sectorial Matrices","authors":"H. Mohammadzadehkan, S. Malekinejad, M. Sababheh","doi":"10.1007/s11565-026-00679-4","DOIUrl":"10.1007/s11565-026-00679-4","url":null,"abstract":"<div><p>In this paper, we introduce new inequalities for positive definite matrices using the interpolational paths of the power means. Specifically, for positive definite matrices <span>( A, B)</span>, given <span>( q le 1 le p )</span> with <span>( q ne p )</span> and <span>( 0< nu le mu < 1 )</span>, we prove that </p><div><div><span>$$ frac{nu }{mu } le frac{A , m_{p,nu } , B - A , m_{q, nu } , B}{A , m_{p,mu } , B - A , m_{q, mu } , B} le frac{1 - nu }{1 - mu }, $$</span></div></div><p>where <span>(A , m_{p,mu } , B)</span> stands for the interpolational path of the power means. We also introduce the interpolational path for sectorial and accretive matrices, deriving inequalities similar to those in the positive definite case by applying the aforementioned inequality. Additionally, we extend these results to sectorial and accretive matrices. We demonstrate that the proposed interpolational path preserves sectorial properties. These findings contribute to the broader study of matrix means, refining inequalities and improving approximations in matrix analysis. In the final section, we derive nuanced inequalities that describe how the geometric mean distributes over the power mean, clarifying the relationships between these matrix means.</p></div>","PeriodicalId":35009,"journal":{"name":"Annali dell''Universita di Ferrara","volume":"72 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148903384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimum solutions for delay integral equations via condensing operators and measure of noncompactness 用压缩算子和非紧性测度求解时滞积分方程的最优解

Annali dell''Universita di Ferrara Pub Date : 2026-09-08 DOI: 10.1007/s11565-026-00745-x

A. Pradhan, D. K. Patel, M. Gabeleh

引用次数: 0

A De Giorgi conjecture on the regularity of minimizers of Cartesian area in 1D 一维笛卡尔面积极小值正则性的一个De Giorgi猜想

Annali dell''Universita di Ferrara Pub Date : 2026-09-08 DOI: 10.1007/s11565-026-00732-2

Giovanni Bellettini, Shokhrukh Yu Kholmatov

引用次数: 0

Q-tensors on Riemannian manifolds with concurrent-recurrent vector fields and its applications in spacetimes 具有并发循环向量场的黎曼流形上的q张量及其在时空中的应用

Annali dell''Universita di Ferrara Pub Date : 2026-09-08 DOI: 10.1007/s11565-026-00743-z

Gaurab Mitra, Avijit Sarkar, Tarak Mandal

引用次数: 0

Fractional counterpart of a higher-order abstract Cauchy problem 高阶抽象柯西问题的分数阶对应

Annali dell''Universita di Ferrara Pub Date : 2026-09-08 DOI: 10.1007/s11565-026-00744-y

Maykel Belluzi, Flank D. M. Bezerra, Maria J. M. Silva

引用次数: 0

Heat and mass transfer impact on Casson nanofluid flow across a stretching surface along with activation energy 热传质随活化能对卡森纳米流体在拉伸表面上流动的影响

Annali dell''Universita di Ferrara Pub Date : 2026-09-07 DOI: 10.1007/s11565-026-00726-0

G. M. Sachin, U. S. Mahabaleshwar, Giulio Lorenzini, David Laroze

{"title":"Heat and mass transfer impact on Casson nanofluid flow across a stretching surface along with activation energy","authors":"G. M. Sachin, U. S. Mahabaleshwar, Giulio Lorenzini, David Laroze","doi":"10.1007/s11565-026-00726-0","DOIUrl":"10.1007/s11565-026-00726-0","url":null,"abstract":"<div><p>Hybrid nanofluids, with their advanced thermophysical properties and promising role in boosting heat transfer efficiency, have become a key area of focus for many researchers in the current era of technology. Novelty of this paper is mainly involved with heat transmission in variable thickness geometry in the existence of an inclined magnetic field, activation energy, and non-linear thermal radiation. Hybrid nanofluid composites are made by dissolving <span>(Al_{2} O_{3})</span>(Aluminium oxide) and <span>(TiO_{2})</span>(Titanium oxide) In base fluid, engine oil. The modified governing equations for momentum and temperature, under relevant boundary conditions, are solved numerically using the precise and efficient bvp-4c Method. The Consequences of an inclined magnetic field, non-linear thermal radiation, power index of velocity, and activation energy are analysed thoroughly, and the outcomes are plotted graphically. Based on the results, we can observe that the fluid velocity decreases as a results considering a magnetic field that is inclined. As the power index velocity rises, the velocity profile reveals a decline.</p></div>","PeriodicalId":35009,"journal":{"name":"Annali dell''Universita di Ferrara","volume":"72 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148903565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unbounded absolutely weak weak Dunford–Pettis operators 无界绝对弱弱邓福德-佩蒂斯算子

Annali dell''Universita di Ferrara Pub Date : 2026-08-27 DOI: 10.1007/s11565-026-00737-x

A. El Kaddouri, Marouan Bengraine, O. Aboutafail

引用次数: 0

Pseudodifferential operators on time-frequency shift invariant ultradistributions with periodic symbols 带周期符号时频移不变超分布上的伪微分算子

Annali dell''Universita di Ferrara Pub Date : 2026-08-27 DOI: 10.1007/s11565-026-00740-2

Gianluca Garello, Alessandro Morando

引用次数: 0