Subjects -> MATHEMATICS (Total: 1013 journals)
    - APPLIED MATHEMATICS (92 journals)
    - GEOMETRY AND TOPOLOGY (23 journals)
    - MATHEMATICS (714 journals)
    - MATHEMATICS (GENERAL) (45 journals)
    - NUMERICAL ANALYSIS (26 journals)
    - PROBABILITIES AND MATH STATISTICS (113 journals)

MATHEMATICS (714 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 538 Journals sorted alphabetically
Abakós     Open Access   (Followers: 3)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 2)
Accounting Perspectives     Full-text available via subscription   (Followers: 4)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 13)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 5)
ACM Transactions on Mathematical Software (TOMS)     Hybrid Journal   (Followers: 6)
ACS Applied Materials & Interfaces     Hybrid Journal   (Followers: 43)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 2)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 3)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 5)
Acta Mathematica Vietnamica     Hybrid Journal  
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal  
Advanced Science Letters     Full-text available via subscription   (Followers: 9)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 6)
Advances in Catalysis     Full-text available via subscription   (Followers: 7)
Advances in Complex Systems     Hybrid Journal   (Followers: 10)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 16)
Advances in Decision Sciences     Open Access   (Followers: 4)
Advances in Difference Equations     Open Access   (Followers: 3)
Advances in Fixed Point Theory     Open Access  
Advances in Geosciences (ADGEO)     Open Access   (Followers: 20)
Advances in Linear Algebra & Matrix Theory     Open Access   (Followers: 6)
Advances in Materials Science     Open Access   (Followers: 21)
Advances in Mathematical Physics     Open Access   (Followers: 6)
Advances in Mathematics     Full-text available via subscription   (Followers: 18)
Advances in Numerical Analysis     Open Access   (Followers: 4)
Advances in Operations Research     Open Access   (Followers: 13)
Advances in Operator Theory     Hybrid Journal  
Advances in Pure Mathematics     Open Access   (Followers: 10)
Advances in Science and Research (ASR)     Open Access   (Followers: 9)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2)
African Journal of Educational Studies in Mathematics and Sciences     Full-text available via subscription   (Followers: 8)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 5)
Afrika Matematika     Hybrid Journal   (Followers: 2)
Air, Soil & Water Research     Open Access   (Followers: 6)
AKSIOMATIK : Jurnal Penelitian Pendidikan dan Pembelajaran Matematika     Open Access  
Al-Jabar : Jurnal Pendidikan Matematika     Open Access  
Al-Qadisiyah Journal for Computer Science and Mathematics     Open Access   (Followers: 3)
AL-Rafidain Journal of Computer Sciences and Mathematics     Open Access   (Followers: 4)
Algebra and Logic     Hybrid Journal   (Followers: 9)
Algebra Colloquium     Hybrid Journal   (Followers: 3)
Algebra Universalis     Hybrid Journal   (Followers: 3)
Algorithmic Operations Research     Open Access   (Followers: 6)
Algorithms     Open Access   (Followers: 14)
Algorithms Research     Open Access   (Followers: 1)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 4)
American Journal of Mathematical Analysis     Open Access   (Followers: 1)
American Journal of Mathematical and Management Sciences     Hybrid Journal  
American Journal of Mathematics     Full-text available via subscription   (Followers: 7)
American Journal of Operations Research     Open Access   (Followers: 6)
American Mathematical Monthly     Full-text available via subscription   (Followers: 3)
An International Journal of Optimization and Control: Theories & Applications     Open Access   (Followers: 12)
Analele Universitatii Ovidius Constanta - Seria Matematica     Open Access  
Analysis and Applications     Hybrid Journal   (Followers: 2)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 7)
Anargya : Jurnal Ilmiah Pendidikan Matematika     Open Access  
Annales Mathematicae Silesianae     Open Access  
Annales mathématiques du Québec     Hybrid Journal   (Followers: 3)
Annales Universitatis Mariae Curie-Sklodowska, sectio A – Mathematica     Open Access   (Followers: 1)
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica     Open Access  
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1)
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Data Science     Hybrid Journal   (Followers: 15)
Annals of Functional Analysis     Hybrid Journal   (Followers: 2)
Annals of Mathematics     Full-text available via subscription   (Followers: 5)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 13)
Annals of PDE     Hybrid Journal  
Annals of Pure and Applied Logic     Open Access   (Followers: 5)
Annals of the Alexandru Ioan Cuza University - Mathematics     Open Access   (Followers: 1)
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1)
Annals of West University of Timisoara - Mathematics     Open Access   (Followers: 1)
Annals of West University of Timisoara - Mathematics and Computer Science     Open Access   (Followers: 2)
Annuaire du Collège de France     Open Access   (Followers: 6)
ANZIAM Journal     Open Access   (Followers: 1)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 3)
Applications of Mathematics     Hybrid Journal   (Followers: 3)
Applied Categorical Structures     Hybrid Journal   (Followers: 5)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 16)
Applied Mathematics     Open Access   (Followers: 6)
Applied Mathematics     Open Access   (Followers: 6)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 7)
Applied Mathematics - A Journal of Chinese Universities     Hybrid Journal   (Followers: 1)
Applied Mathematics and Nonlinear Sciences     Open Access   (Followers: 1)
Applied Mathematics Letters     Full-text available via subscription   (Followers: 3)
Applied Mathematics Research eXpress     Hybrid Journal   (Followers: 1)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 4)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 5)
Arab Journal of Mathematical Sciences     Open Access   (Followers: 3)
Arabian Journal of Mathematics     Open Access   (Followers: 1)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 3)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 4)
Archive of Numerical Software     Open Access  
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
Armenian Journal of Mathematics     Open Access  
Arnold Mathematical Journal     Hybrid Journal   (Followers: 1)
Artificial Satellites     Open Access   (Followers: 21)
Asia-Pacific Journal of Operational Research     Hybrid Journal   (Followers: 3)
Asian Journal of Algebra     Open Access   (Followers: 1)
Asian Research Journal of Mathematics     Open Access  
Asian-European Journal of Mathematics     Hybrid Journal   (Followers: 2)
Australian Mathematics Teacher, The     Full-text available via subscription   (Followers: 7)
Australian Primary Mathematics Classroom     Full-text available via subscription   (Followers: 5)
Australian Senior Mathematics Journal     Full-text available via subscription   (Followers: 1)
Automatic Documentation and Mathematical Linguistics     Hybrid Journal   (Followers: 5)
Axioms     Open Access   (Followers: 1)
Baltic International Yearbook of Cognition, Logic and Communication     Open Access   (Followers: 2)
Banach Journal of Mathematical Analysis     Hybrid Journal  
Basin Research     Hybrid Journal   (Followers: 6)
BIBECHANA     Open Access  
Biomath     Open Access  
BIT Numerical Mathematics     Hybrid Journal  
Boletim Cearense de Educação e História da Matemática     Open Access  
Boletim de Educação Matemática     Open Access  
Boletín de la Sociedad Matemática Mexicana     Hybrid Journal  
Bollettino dell'Unione Matematica Italiana     Full-text available via subscription  
British Journal for the History of Mathematics     Hybrid Journal   (Followers: 2)
British Journal of Mathematical and Statistical Psychology     Full-text available via subscription   (Followers: 18)
British Journal of Mathematics & Computer Science     Full-text available via subscription   (Followers: 1)
Buletinul Academiei de Stiinte a Republicii Moldova. Matematica     Open Access   (Followers: 2)
Bulletin des Sciences Mathamatiques     Full-text available via subscription   (Followers: 3)
Bulletin of Dnipropetrovsk University. Series : Communications in Mathematical Modeling and Differential Equations Theory     Open Access   (Followers: 3)
Bulletin of Mathematical Sciences     Open Access   (Followers: 1)
Bulletin of Symbolic Logic     Full-text available via subscription   (Followers: 4)
Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics     Open Access  
Bulletin of the Australian Mathematical Society     Full-text available via subscription   (Followers: 2)
Bulletin of the Brazilian Mathematical Society, New Series     Hybrid Journal  
Bulletin of the Iranian Mathematical Society     Hybrid Journal  
Bulletin of the London Mathematical Society     Hybrid Journal   (Followers: 3)
Bulletin of the Malaysian Mathematical Sciences Society     Hybrid Journal  
Cadernos do IME : Série Matemática     Open Access  
Calculus of Variations and Partial Differential Equations     Hybrid Journal   (Followers: 1)
Canadian Journal of Mathematics / Journal canadien de mathématiques     Hybrid Journal  
Canadian Journal of Science, Mathematics and Technology Education     Hybrid Journal   (Followers: 20)
Canadian Mathematical Bulletin     Hybrid Journal  
Carpathian Mathematical Publications     Open Access  
Catalysis in Industry     Hybrid Journal  
CAUCHY     Open Access   (Followers: 1)
CEAS Space Journal     Hybrid Journal   (Followers: 5)
CHANCE     Hybrid Journal   (Followers: 5)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 1)
Chaos, Solitons & Fractals : X     Open Access   (Followers: 1)
ChemSusChem     Hybrid Journal   (Followers: 8)
Chinese Annals of Mathematics, Series B     Hybrid Journal  
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Mathematics     Open Access  
Ciencia     Open Access  
CODEE Journal     Open Access  
Cogent Mathematics     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 3)
Collectanea Mathematica     Hybrid Journal  
College Mathematics Journal     Hybrid Journal   (Followers: 3)
COMBINATORICA     Hybrid Journal  
Combinatorics, Probability and Computing     Hybrid Journal   (Followers: 5)
Combustion Theory and Modelling     Hybrid Journal   (Followers: 20)
Commentarii Mathematici Helvetici     Hybrid Journal   (Followers: 1)
Communications in Combinatorics and Optimization     Open Access  
Communications in Contemporary Mathematics     Hybrid Journal  
Communications in Mathematical Physics     Hybrid Journal   (Followers: 3)
Communications On Pure & Applied Mathematics     Hybrid Journal   (Followers: 6)
Complex Analysis and its Synergies     Open Access   (Followers: 1)
Complex Variables and Elliptic Equations: An International Journal     Hybrid Journal  
Compositio Mathematica     Full-text available via subscription   (Followers: 2)
Comptes Rendus : Mathematique     Open Access  
Computational and Applied Mathematics     Hybrid Journal   (Followers: 3)
Computational and Mathematical Methods     Hybrid Journal  
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 2)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 2)
Computational Complexity     Hybrid Journal   (Followers: 5)
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 8)
Computational Mechanics     Hybrid Journal   (Followers: 11)
Computational Methods and Function Theory     Hybrid Journal  
Computational Optimization and Applications     Hybrid Journal   (Followers: 9)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 10)
Confluentes Mathematici     Hybrid Journal  
Constructive Mathematical Analysis     Open Access  
Contributions to Discrete Mathematics     Open Access  
Contributions to Game Theory and Management     Open Access  
COSMOS     Hybrid Journal   (Followers: 1)
Cross Section     Full-text available via subscription   (Followers: 1)
Cryptography and Communications     Hybrid Journal   (Followers: 11)
Cuadernos de Investigación y Formación en Educación Matemática     Open Access  
Cubo. A Mathematical Journal     Open Access  
Current Research in Biostatistics     Open Access   (Followers: 8)
Czechoslovak Mathematical Journal     Hybrid Journal  
Daya Matematis : Jurnal Inovasi Pendidikan Matematika     Open Access  
Demographic Research     Open Access   (Followers: 14)
Design Journal : An International Journal for All Aspects of Design     Hybrid Journal   (Followers: 35)
Desimal : Jurnal Matematika     Open Access  
Dhaka University Journal of Science     Open Access  
Differential Equations and Dynamical Systems     Hybrid Journal   (Followers: 2)
Differentsial'nye Uravneniya     Open Access  
Digital Experiences in Mathematics Education     Hybrid Journal   (Followers: 3)
Discrete Mathematics     Hybrid Journal   (Followers: 7)
Discrete Mathematics & Theoretical Computer Science     Open Access   (Followers: 1)
Discrete Mathematics, Algorithms and Applications     Hybrid Journal   (Followers: 2)
Discussiones Mathematicae - General Algebra and Applications     Open Access  
Discussiones Mathematicae Graph Theory     Open Access   (Followers: 1)
Diskretnaya Matematika     Full-text available via subscription  
Doklady Akademii Nauk     Open Access  

        1 2 3 4 | Last

Similar Journals
Journal Cover
Boletín de la Sociedad Matemática Mexicana
Number of Followers: 0  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1405-213X - ISSN (Online) 2296-4495
Published by Springer-Verlag Homepage  [2467 journals]
  • An algebra over the operad of posets and structural binomial identities

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      Abstract: Abstract We study generating functions of strict and non-strict order polynomials of series–parallel posets, called order series. These order series are closely related to Ehrhart series and \(h^*\) -polynomials of the associated order polytopes. We explain how they can be understood as algebras over a certain operad of posets. Our main results are based on the fact that the order series of chains form a basis in the space of order series. This allows to reduce the search space of an algorithm that finds for a given power series f(x), if possible, a poset P such that f(x) is the generating function of the order polynomial of P. In terms of Ehrhart theory of order polytopes, the coordinates with respect to this basis describe the number of (internal) simplices in the canonical triangulation of the order polytope of P. Furthermore, we derive a new proof of the reciprocity theorem of Stanley. As an application, we find new identities for binomial coefficients and for finite partitions that allow for empty sets, and we describe properties of the negative hypergeometric distribution.
      PubDate: 2022-11-17
       
  • Existence of weak solutions to a p-Laplacian system on the Sierpiński
           gasket on $${\mathbb {R}}^2$$

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      Abstract: Abstract We study the existence of weak solutions for the following boundary value problem $$\begin{aligned} \left\{ \begin{array}{ll} -\Delta _pu =\displaystyle \frac{\alpha }{ \alpha +\beta }a(x) u ^{\alpha -2}u v ^\beta & \quad {\mathrm{in}} \,\, {\mathcal {S}} {\setminus } {\mathcal {S}}_0, \\ -\Delta _p v =\displaystyle \frac{\beta }{\alpha +\beta }a(x) u ^\alpha v ^{\beta -2} v &\quad {\mathrm{in}} \,\, {\mathcal {S}} {\setminus } {\mathcal {S}}_0, \\ v= u =0 &\quad {\mathrm{in}} \,\,{\mathcal {S}}_0. \end{array}\right. \end{aligned}$$ where \({\mathcal {S}}\) is the Sirpiński gasket on \({\mathbb {R}}^2\) , \({\mathcal {S}}_0\) is its boundary and \(\Delta _p\) is the weak p-Laplacian operator on fractal domain, under some conditions on the function a and the reals \(p, \alpha\) and \(\beta\) .
      PubDate: 2022-11-17
       
  • Classification of unstable quartic plane curves

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      Abstract: Abstract Consider the action by change of coordinates in the space of quartic plane curves. We classify the unstable points of this action through a stratification by irreducible, smooth and locally closed subvarieties. Concretely, we show that these varieties parametrize quartic plane curves with specific singularities, we compute their dimensions and closure. In addition, we show that the space of unstable points consists of two irreducible components which are the closure of two of the strata.
      PubDate: 2022-11-14
       
  • On relative monogeneity of a family of number fields defined by
           $$X^{p^n}+aX^{p^s}-b$$

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      Abstract: Abstract Let K be a number field with the ring of integers R and \(L=K(\alpha )\) . In this work, we give necessary and sufficient conditions on \(a,\; b,\; s,\; n\) so that the irreducible polynomial \(P(X)=X^{p^n}\,+\,a\,X^{p^s}-b\) of R[X] \((n,s\in {\mathbb {N}},\,\, n\, \,>\,\,s)\) of \(\alpha\) is monogenic. We bring forward a family of monogenic extensions over quadratic fields, as result we give their integral bases over \({\mathbb {Q}}\) and absolute discriminants.
      PubDate: 2022-11-05
       
  • Singular integral operators for rearrangement-invariant Morrey spaces on
           local fields

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      Abstract: Abstract This paper established the boundedness of singular integral operator for Morrey spaces on local fields built on the rearrangement-invariant Banach function spaces. It gives an extension on the study of the singular integral operators on p-adic Morrey spaces. This studies also cover the generalized Morrey spaces, the Lorentz-Morrey spaces and the Lorentz-Karamata-Morrey spaces on local fields.
      PubDate: 2022-11-04
       
  • Nikol’skii-type inequalities for entire functions of exponential type in
           Lorentz–Zygmund spaces

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      Abstract: Abstract Nikol’skii-type inequalities for entire functions of exponential type on \({\mathbb{R}}^{n}\) for the Lorentz–Zygmund spaces are obtained. Some new limiting cases are examined. Application to Besov–type spaces of logarithmic smoothness is given.
      PubDate: 2022-11-03
       
  • Inverse problem for a differential operator on a star-shaped graph with
           nonlocal matching condition

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      Abstract: Abstract In this paper, we develop two approaches to investigation of inverse spectral problems for a new class of nonlocal operators on metric graphs. The Laplace differential operator is considered on a star-shaped graph with nonlocal integral matching condition. This operator is adjoint to the functional-differential operator with frozen argument at the central vertex of the graph. We study the inverse problem that consists in the recovery of the integral condition coefficients from the eigenvalues. We obtain the spectrum characterization, reconstruction algorithms, and prove the uniqueness of the inverse problem solution.
      PubDate: 2022-11-02
       
  • Algebraic number fields generated by an infinite family of monogenic
           trinomials

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      Abstract: Abstract For an infinite family of monogenic trinomials \(P(X)=X^3\pm 3rbX-b\in {\mathbb {Z}}[X]\) , arithmetical invariants of the cubic number field \(L={\mathbb {Q}}(\theta )\) , generated by a zero \(\theta\) of \(P(X)\) , and of its Galois closure \(N=L(\sqrt{d_L})\) are determined. The conductor \(f\) of the cyclic cubic relative extension \(N/K\) , where \(K={\mathbb {Q}}(\sqrt{d_L})\) denotes the unique quadratic subfield of \(N\) , is proved to be of the form \(3^eb\) with \(e\in \lbrace 1,2\rbrace\) , which admits statements concerning primitive ambiguous principal ideals, lattice minima, and independent units in \(L\) . The number \(m\) of non-isomorphic cubic fields \(L_1,\ldots ,L_m\) sharing a common discriminant \(d_{L_i}=d_L\) with \(L\) is determined.
      PubDate: 2022-11-01
       
  • Localization operators associated with the Kontorovich–Lebedev
           wavelet transform

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      Abstract: Abstract In this paper, we define the localization operators associated to the Kontorovich–Lebedev wavelet (KL-wavelet) transform. Next we prove the boundedness and compactness of these operators, we also show that these operators are in Schatten-von Neumann class, we give a trace formula.
      PubDate: 2022-10-26
       
  • On m-convexity in $$CV_{(0)}(X,A)$$

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      Abstract: Abstract Let X be a completely regular Hausdorff space and V a Nachbin family on X. For a locally convex algebra A, let \(CV_{(0)}(X, A)\) be the algebra of all weighted vector-valued continuous functions with the topology given by the uniform seminorms induced by V. In this paper, we study completeness, m-convexity and locally \(C^{*}\) -property in \(CV_{(0)}(X,A)\) .
      PubDate: 2022-10-26
       
  • Global exponential stability of almost periodic solutions for
           quaternion-valued RNNs with mixed delays on time scales

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      Abstract: Abstract This paper deals with the time scale model of time-delayed quaternion-valued recurrent neural networks (QVRNNs). Using contraction mapping principle and exponential dichotomy of linear dynamic equations, we derive sufficient conditions for the existence, uniqueness and the global exponential stability of almost periodic solutions to the addressed QVRNNs. Finally, an appropriate example is given to check the feasibility of our obtained results.
      PubDate: 2022-10-11
       
  • Global well-posedness, Gevrey class regularity and large time asymptotics
           for the dissipative quasi-geostrophic equation in Fourier–Besov spaces

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      Abstract: Abstract In this article, we consider the Cauchy problem of the dissipative quasi-geostrophic equation in critical Fourier–Besov spaces. Using the bilinear-type fixed point theory, we obtain the global well-posedness results and we prove the existence and uniqueness of analytic solutions with small initial data belonging to the critical Fourier–Besov spaces \({\mathscr {F}}B_{p,q}^{1-2\alpha +\frac{2}{p'}} \) . In addition, we show the stability of global solutions.
      PubDate: 2022-10-01
       
  • A class of semigroup homomorphisms arising from the product in a pure
           quartic number field

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      Abstract: Abstract Let \(\alpha \in \mathbb {R}\) and let \(\mathcal {S}\) be a semigroup. The purpose of the present paper is to find the solutions \(f:\mathbb {R} ^{4}\rightarrow \mathcal {S}\) of the parametric (semigroup valued) functional equation $$\begin{aligned}&f(x_{1},y_{1},z_{1},w_{1})f(x_{2},y_{2},z_{2},w_{2}) \\&\quad =f(x_{1}x_{2}+\alpha y_{1}w_{2}+\alpha y_{2}w_{1}+\alpha z_{1}z_{2},x_{1}y_{2}+x_{2}y_{1}+\alpha z_{1}w_{2}+\alpha z_{2}w_{1}, \\&\quad x_{1}z_{2}+x_{2}z_{1}+y_{1}y_{2}+\alpha w_{1}w_{2},x_{1}w_{2}+x_{2}w_{1}+y_{1}z_{2}+y_{2}z_{1}), \end{aligned}$$ which arises from the product in a quartic number field. For \(\alpha \geqslant 0,\) its scalar-valued solutions are determined in [13].
      PubDate: 2022-09-30
       
  • Barabasi–Albert trees are hypoenergetic

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      Abstract: Abstract We prove that graphs following the model of Barabasi–Albert tree with n vertices are hypoenergetic in the large n limit.
      PubDate: 2022-09-24
       
  • Bornological spaces

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      Abstract: Abstract Bornology is a study of bounded sets, the spaces of such objects, and the naturally associated maps between the spaces of such objects. Previously, the setting for such a study has most often been in the presence of another type of structure such as metrics, topologies, uniformities, and/or, some sort of an algebraic structure with bounded sets being considered only as these were useful in the study of the main objects of concern. Here we carry out a study of bornology with its objects and maps and with these as the focus of the study. We describe the nature of the objects and maps of such things as subspaces, products, quotients, sums, etc., of the resulting category of those spaces. Mathematicians working on research projects centered around various kinds of topology related objects and maps will no doubt find the contents of the present paper very useful and efficient in that these mathematicians will not need to define boundedness related concepts or prove theorems about bounded sets since these items are within this present paper.
      PubDate: 2022-09-19
       
  • Lagrangian surfaces of constant angle in the complex Euclidean plane

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      Abstract: Abstract We investigate some geometric properties of Lagrangian surfaces, in the complex Euclidean plane \(\mathbb {C}^2\) , which make a constant angle with respect to a parallel vector field Z. This latter condition means that the angle function, between the tangent planes of the surface and Z, is a constant. The first basic property is that if M is a Lagrangian surface of constant angle with respect to Z, then it also has constant angle with respect to JZ, where J is the standard almost complex structure on \(\mathbb {C}^2\) . In particular, we have that its tangent components \(Z^\top \) and \(J Z^\perp \) are two vector fields on M of constant length. When they are linearly dependent we deduce that M should be part of a Lagrangian cylinder. When they are linearly independent, we have a frame on M. We use this frame to investigate the properties of these surfaces. The Gaussian curvature is not necessarily constant zero as in the case of the Lagrangian cylinder. In particular, if the angle between \(Z^\top \) and \(J Z^\perp \) is constant we prove that M is part of a Lagrangian plane. Finally, we investigate these surfaces with a parametrization and we give a system of two PDE’s in two variables that are the equivalent conditions to be a Lagrangian surface of constant angle.
      PubDate: 2022-09-16
       
  • Armendariz-like properties in bi-amalgamations

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      Abstract: Abstract This paper examines the transfer of the Armendariz (resp., weak Armendariz, resp., nil-Armendariz) property to bi-amalgamations. Our results cover previously known results on amalgamations, and provide the construction of various and original examples satisfying the above-mentioned properties.
      PubDate: 2022-09-10
      DOI: 10.1007/s40590-022-00459-y
       
  • Recovering differential operators with two retarded arguments

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      Abstract: Abstract This paper deals with non-self-adjoint second-order Differential Operators with two constant delays \(\tau _i\) , \(i=1,2\) which are less than half the length of the interval. We consider the case when \(\frac{2\pi }{5} \le \tau _i \le \frac{\pi }{2}\) and potentials \(q_k\) are functions from \(L_2 [\tau _k,\pi ]\) , \(k=1,2\) . We study the inverse spectral problem of recovering operators from their spectral characteristics. Four boundary value problems are considered and we prove that delays and potentials are uniquely determined from their spectra.
      PubDate: 2022-09-05
      DOI: 10.1007/s40590-022-00462-3
       
  • On the nearly freeness of conic-line arrangements with nodes, tacnodes,
           and ordinary triple points

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      Abstract: Abstract In the present note, we provide a partial classification of nearly free conic-line arrangements in the complex plane having nodes, tacnodes, and ordinary triple points. In this setting, our theoretical bound tells us that the degree of such an arrangement is bounded from above by 12. We construct examples of nearly free conic-line arrangements having degree 3, 4, 5, 6, 7, and we prove that in degree 10, 11, and 12, there is no such arrangement.
      PubDate: 2022-08-30
      DOI: 10.1007/s40590-022-00461-4
       
  • Congruences modulo powers of 2 for t-colored overpartitions

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      Abstract: Abstract Let \(\overline{p}_{-t}(n)\) count the number of t-colored overpartition of n, with t= 5, 7, 11 and 13. We find several infinite families of congruences modulo 16 and 32 for \(\overline{p}_{-t}(n)\) . For example, For each \(\alpha\) , \(\beta\) and \(\gamma \ge 0\) , $$\begin{aligned} \overline{p}_{-11}\left(8\cdot 3^{4\alpha }\cdot 5^{2\beta +2}\cdot 7^{2\gamma }n+t_5\cdot 3^{4\alpha }\cdot 5^{2\beta +1}\cdot 7^{2\gamma }\right)\equiv 0 \pmod {32}, \end{aligned}$$ where \(t_5\in \{7, 23, 31, 39\}.\)
      PubDate: 2022-08-26
      DOI: 10.1007/s40590-022-00464-1
       
 
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