Ricerche di Matematica最新文献_第3页

A robust stability criterion in the one-dimensional subdiffusion equation with Caputo–Fabrizio fractional derivative 带有卡普托-法布里齐奥分数导数的一维子扩散方程中的稳健稳定性准则

IF 1.2 4区数学

Ricerche di Matematica Pub Date : 2024-04-15 DOI: 10.1007/s11587-024-00861-w

R. Temoltzi-Ávila

引用次数: 0

A note on the regularity criterion of the Boussinesq equations with zero heat conductivity 关于导热系数为零的布森斯克方程正则准则的说明

IF 1.2 4区数学

Ricerche di Matematica Pub Date : 2024-04-13 DOI: 10.1007/s11587-024-00860-x

S. Gala

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Some improvements on generalized reversed aging intensity functions 广义反向老化强度函数的一些改进

IF 1.2 4区数学

Ricerche di Matematica Pub Date : 2024-04-13 DOI: 10.1007/s11587-024-00862-9

Francesco Buono, Maria Longobardi, Magdalena Szymkowiak

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A criterion for a normal subgroup to be hypercentral based on class sizes 基于班级人数的正态分组超中心标准

IF 1.2 4区数学

Ricerche di Matematica Pub Date : 2024-04-09 DOI: 10.1007/s11587-024-00856-7

Antonio Beltrán

引用次数: 0

On Ricci solitons with quarter-symmetric connection 关于具有四分之一对称连接的利玛窦孤子

IF 1.2 4区数学

Ricerche di Matematica Pub Date : 2024-04-09 DOI: 10.1007/s11587-024-00851-y

Mehraj Ahmad Lone, Idrees Fayaz Harry

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On commuting automorphisms of some groups 论某些群的换向自形

IF 1.2 4区数学

Ricerche di Matematica Pub Date : 2024-04-09 DOI: 10.1007/s11587-024-00853-w

Nazila Azimi Shahrabi, Mehri Akhavan Malayeri

{"title":"On commuting automorphisms of some groups","authors":"Nazila Azimi Shahrabi, Mehri Akhavan Malayeri","doi":"10.1007/s11587-024-00853-w","DOIUrl":"https://doi.org/10.1007/s11587-024-00853-w","url":null,"abstract":"Let G be a group. If the set ({mathcal {A}}(G)=lbrace alpha in {textit{Aut}}(G): xalpha (x)=alpha (x)x; textit{for all}; xin Grbrace ) forms a subgroup of ({textit{Aut}}(G)), then G is called ({mathcal {A}})-group. In this paper, we prove that a metacyclic group is an ({mathcal {A}})-group. Also, we show that, for any positive integer n and any prime number p, there exists a finite ({mathcal {A}}) p-group of nilpotency class n. Since there exist finite non ({mathcal {A}}) p-groups with (vert G/G^{prime }vert = p^{4}), we find suitable conditions implying that a finite p-group with (vert G/G^{prime }vert le p^{3}) is an ({mathcal {A}})-group. Using these results, we show that there exists a finite ({mathcal {A}}) p-group G of order (p^{n}) for all (nge 4) such that ({mathcal {A}}(G)) is equal to the central automorphisms group of G. Finally, we use semidirect product and wreath product of groups to obtain suitable examples.\u0000","PeriodicalId":21373,"journal":{"name":"Ricerche di Matematica","volume":"49 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140564167","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

New criteria for $$sigma $$ -subnormality in $$sigma $$ -solvable finite groups $$sigma$$可解有限群中$$sigma$$次正态性的新标准

IF 1.2 4区数学

Ricerche di Matematica Pub Date : 2024-04-07 DOI: 10.1007/s11587-024-00855-8

Julian Kaspczyk, Fawaz Aseeri

{"title":"New criteria for $$sigma $$ -subnormality in $$sigma $$ -solvable finite groups","authors":"Julian Kaspczyk, Fawaz Aseeri","doi":"10.1007/s11587-024-00855-8","DOIUrl":"https://doi.org/10.1007/s11587-024-00855-8","url":null,"abstract":"Let (mathbb {P}) be the set of all prime numbers, I be a set and (sigma = lbrace sigma _i mid i in I rbrace ) be a partition of (mathbb {P}). A finite group is said to be (sigma )-primary if it is a (sigma _i)-group for some (i in I), and we say that a finite group is (sigma )-solvable if all its chief factors are (sigma )-primary. A subgroup H of a finite group G is said to be (sigma )-subnormal in G if there is a chain (H = H_0 le H_1 le dots le H_n = G) of subgroups of G such that (H_{i-1}) is normal in (H_i) or (H_i/(H_{i-1})_{H_i}) is (sigma )-primary for all (1 le i le n). Given subgroups H and A of a (sigma )-solvable finite group G, we prove two criteria for H to be (sigma )-subnormal in (langle H, A rangle ). Our criteria extend classical subnormality criteria of Fumagalli [5], which themselves generalize a classical subnormality criterion of Wielandt [13].","PeriodicalId":21373,"journal":{"name":"Ricerche di Matematica","volume":"38 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140564182","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

Inferring Bayesian ageing notions of bivariate distributions from univariate ageing 从单变量老化推断双变量分布的贝叶斯老化概念

IF 1.2 4区数学

Ricerche di Matematica Pub Date : 2024-04-07 DOI: 10.1007/s11587-024-00854-9

N. Unnikrishnan Nair, S. M. Sunoj

引用次数: 0

Two-character sets, Veronese varieties and Grassmannian of lines 二字集、维罗纳变种和格拉斯曼线

IF 1.2 4区数学

Ricerche di Matematica Pub Date : 2024-04-06 DOI: 10.1007/s11587-024-00858-5

A. Cossidente, G. Marino

引用次数: 0

Geometric hyperplanes of the Lie geometry $$A_{n,{1,n}}(mathbb {F})$$ 列几何学的几何超平面 $$A_{n,{1,n}}(mathbb {F})$$

IF 1.2 4区数学

Ricerche di Matematica Pub Date : 2024-04-06 DOI: 10.1007/s11587-024-00859-4

Antonio Pasini

{"title":"Geometric hyperplanes of the Lie geometry $$A_{n,{1,n}}(mathbb {F})$$","authors":"Antonio Pasini","doi":"10.1007/s11587-024-00859-4","DOIUrl":"https://doi.org/10.1007/s11587-024-00859-4","url":null,"abstract":"In this paper we investigate hyperplanes of the point-line geometry (A_{n,{1,n}}(mathbb {F})) of point-hyerplane flags of the projective geometry (textrm{PG}(n,mathbb {F})). Renouncing a complete classification, which is not yet within our reach, we describe the hyperplanes which arise from the natural embedding of (A_{n,{1,n}}(mathbb {F})), that is the embedding which yields the adjoint representation of (textrm{SL}(n+1,mathbb {F})). By exploiting properties of a particular sub-class of these hyerplanes, namely the singular hyperplanes, we shall prove that all hyperplanes of (A_{n,{1,n}}(mathbb {F})) are maximal subspaces of (A_{n,{1,n}}(mathbb {F})). Hyperplanes of (A_{n,{1,n}}(mathbb {F})) can also be contructed starting from suitable line-spreads of (textrm{PG}(n,mathbb {F})) (provided that (textrm{PG}(n,mathbb {F})) admits line-spreads, of course). Explicitly, let (mathfrak {S}) be a composition line-spread of (textrm{PG}(n,mathbb {F})) such that every hyperplane of (textrm{PG}(n,mathbb {F})) contains a sub-hyperplane of (textrm{PG}(n,mathbb {F})) spanned by lines of (mathfrak {S}). Then the set of points (p, H) of (A_{n,{1,n}}(mathbb {F})) such that H contains the member of (mathfrak {S}) through p is a hyperplane of (A_{n,{1,n}}(mathbb {F})). We call these hyperplanes hyperplanes of spread type. Many but not all of them arise from the natural embedding.","PeriodicalId":21373,"journal":{"name":"Ricerche di Matematica","volume":"26 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140564269","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