Demonstratio Mathematica最新文献_第8页

Certain aspects of Nörlund ℐ-statistical convergence of sequences in neutrosophic normed spaces 中性粒细胞赋范空间中序列的Nörlund -统计收敛性的某些方面

IF 2 3区数学

Demonstratio Mathematica Pub Date : 2023-01-01 DOI: 10.1515/dema-2022-0194

Ö. Kişi, M. Gürdal, Burak Çakal

引用次数: 0

Generalized Stević-Sharma operators from the minimal Möbius invariant space into Bloch-type spaces 从最小Möbius不变空间到Bloch-type空间的广义Stević-Sharma算子

3区数学

Demonstratio Mathematica Pub Date : 2023-01-01 DOI: 10.1515/dema-2022-0245

Zhitao Guo

引用次数: 0

On I. Meghea and C. S. Stamin review article “Remarks on some variants of minimal point theorem and Ekeland variational principle with applications,” Demonstratio Mathematica 2022; 55: 354–379 关于I. Meghea和C. S. Stamin对《极小点定理和Ekeland变分原理的若干变体及其应用的评述》，《数学演示》，2022;55岁:354 - 379

3区数学

Demonstratio Mathematica Pub Date : 2023-01-01 DOI: 10.1515/dema-2023-0102

Alfred Göpfert, Christiane Tammer, Constantin Zălinescu

引用次数: 0

Approximation spaces inspired by subset rough neighborhoods with applications 子集粗糙邻域启发的逼近空间及其应用

IF 2 3区数学

Demonstratio Mathematica Pub Date : 2023-01-01 DOI: 10.1515/dema-2022-0223

T. Al-shami, A. Mhemdi

{"title":"Approximation spaces inspired by subset rough neighborhoods with applications","authors":"T. Al-shami, A. Mhemdi","doi":"10.1515/dema-2022-0223","DOIUrl":"https://doi.org/10.1515/dema-2022-0223","url":null,"abstract":"Abstract In this manuscript, we first generate topological structures by subset neighborhoods and ideals and apply to establish some generalized rough-set models. Then, we present other types of generalized rough-set models directly defined by the concepts of subset neighborhoods and ideals. We explore the main characterizations of the proposed approximation spaces and compare them in terms of approximation operators and accuracy measures. The obtained results and given examples show that the second type of the proposed approximation spaces is better than the first one in cases of u u and ⟨ u ⟩ langle urangle , whereas the relationships between the rest of the six cases are posted as an open question. Moreover, we demonstrate the advantages of the current models to decrease the upper approximation and increase the lower approximation compared to the existing approaches in published literature. Algorithms and a flow chart are given to illustrate how the exact and rough sets are determined for each approach. Finally, we analyze the information system of dengue fever to confirm the efficiency of our approaches to maximize the value of accuracy and shrink the boundary regions.","PeriodicalId":10995,"journal":{"name":"Demonstratio Mathematica","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49402220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 5

Duality for convolution on subclasses of analytic functions and weighted integral operators 解析函数和加权积分算子子类上卷积的对偶性

IF 2 3区数学

Demonstratio Mathematica Pub Date : 2023-01-01 DOI: 10.1515/dema-2022-0168

E. Amini, M. Fardi, S. Al-Omari, K. Nonlaopon

{"title":"Duality for convolution on subclasses of analytic functions and weighted integral operators","authors":"E. Amini, M. Fardi, S. Al-Omari, K. Nonlaopon","doi":"10.1515/dema-2022-0168","DOIUrl":"https://doi.org/10.1515/dema-2022-0168","url":null,"abstract":"Abstract In this article, we investigate a class of analytic functions defined on the unit open disc U = { z : ∣ z ∣ < 1 } {mathcal{U}}=left{z:| z| lt 1right} , such that for every f ∈ P α ( β , γ ) fin {{mathcal{P}}}_{alpha }left(beta ,gamma ) , α > 0 alpha gt 0 , 0 ≤ β ≤ 1 0le beta le 1 , 0 < γ ≤ 1 0lt gamma le 1 , and ∣ z ∣ < 1 | z| lt 1 , the inequality Re f ′ ( z ) + 1 − γ α γ z f ″ ( z ) − β 1 − β > 0 {rm{Re}}left{frac{f^{prime} left(z)+frac{1-gamma }{alpha gamma }z{f}^{^{primeprime} }left(z)-beta }{1-beta }right}gt 0 holds. We find conditions on the numbers α , β alpha ,beta , and γ gamma such that P α ( β , γ ) ⊆ S P ( λ ) {{mathcal{P}}}_{alpha }left(beta ,gamma )subseteq SPleft(lambda ) , for λ ∈ ( − π 2 , π 2 ) lambda in left(-frac{pi }{2},frac{pi }{2}) , where S P ( λ ) SPleft(lambda ) denotes the set of all λ lambda -spirallike functions. We also make use of Ruscheweyh’s duality theory to derive conditions on the numbers α , β , γ alpha ,beta ,gamma and the real-valued function φ varphi so that the integral operator V φ ( f ) {V}_{varphi }(f) maps the set P α ( β , γ ) {{mathcal{P}}}_{alpha }left(beta ,gamma ) into the set S P ( λ ) SPleft(lambda ) , provided φ varphi is non-negative normalized function ( ∫ 0 1 φ ( t ) d t = 1 ) left({int }_{0}^{1}varphi left(t){rm{d}}t=1) and V φ ( f ) ( z ) = ∫ 0 1 φ ( t ) f ( t z ) t d t . {V}_{varphi }(f)left(z)=underset{0}{overset{1}{int }}varphi left(t)frac{fleft(tz)}{t}{rm{d}}t.","PeriodicalId":10995,"journal":{"name":"Demonstratio Mathematica","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48766088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

On the order of approximation by modified summation-integral-type operators based on two parameters 基于两参数的修正求和积分型算子的逼近阶

IF 2 3区数学

Demonstratio Mathematica Pub Date : 2023-01-01 DOI: 10.1515/dema-2022-0182

S. A. Mohiuddine, Karunesh Singh, Abdullah Alotaibi

引用次数: 6

Compositions of positive integers with 2s and 3s 正整数与2s和3s的组合

IF 2 3区数学

Demonstratio Mathematica Pub Date : 2023-01-01 DOI: 10.1515/dema-2022-0227

Orhan Dişkaya, H. Menken

引用次数: 0

Asymptotic study of Leray solution of 3D-Navier-Stokes equations with exponential damping 具有指数阻尼的三维Navier-Stokes方程Leray解的渐近研究