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  Subjects -> MATHEMATICS (Total: 1040 journals)
    - APPLIED MATHEMATICS (83 journals)
    - GEOMETRY AND TOPOLOGY (23 journals)
    - MATHEMATICS (770 journals)
    - MATHEMATICS (GENERAL) (43 journals)
    - NUMERICAL ANALYSIS (23 journals)
    - PROBABILITIES AND MATH STATISTICS (98 journals)

MATHEMATICS (770 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 538 Journals sorted alphabetically
Abakós     Open Access   (Followers: 4)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 4)
Academic Voices : A Multidisciplinary Journal     Open Access   (Followers: 2)
Accounting Perspectives     Full-text available via subscription   (Followers: 7)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 15)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 3)
ACM Transactions on Mathematical Software (TOMS)     Hybrid Journal   (Followers: 6)
ACS Applied Materials & Interfaces     Hybrid Journal   (Followers: 38)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1)
Acta Mathematica     Hybrid Journal   (Followers: 12)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 2)
Acta Mathematica Scientia     Full-text available via subscription   (Followers: 5)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 6)
Acta Mathematica Vietnamica     Hybrid Journal  
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal  
Advanced Science Letters     Full-text available via subscription   (Followers: 12)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 4)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 6)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 9)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 21)
Advances in Decision Sciences     Open Access   (Followers: 3)
Advances in Difference Equations     Open Access   (Followers: 3)
Advances in Fixed Point Theory     Open Access   (Followers: 8)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 17)
Advances in Linear Algebra & Matrix Theory     Open Access   (Followers: 10)
Advances in Materials Science     Open Access   (Followers: 17)
Advances in Mathematical Physics     Open Access   (Followers: 7)
Advances in Mathematics     Full-text available via subscription   (Followers: 15)
Advances in Nonlinear Analysis     Open Access  
Advances in Numerical Analysis     Open Access   (Followers: 7)
Advances in Operations Research     Open Access   (Followers: 12)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Pure and Applied Mathematics     Hybrid Journal   (Followers: 8)
Advances in Pure Mathematics     Open Access   (Followers: 9)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2)
African Journal of Educational Studies in Mathematics and Sciences     Full-text available via subscription   (Followers: 7)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 5)
Afrika Matematika     Hybrid Journal   (Followers: 1)
Air, Soil & Water Research     Open Access   (Followers: 13)
AKSIOMA Journal of Mathematics Education     Open Access   (Followers: 2)
Al-Jabar : Jurnal Pendidikan Matematika     Open Access   (Followers: 1)
Algebra and Logic     Hybrid Journal   (Followers: 7)
Algebra Colloquium     Hybrid Journal   (Followers: 4)
Algebra Universalis     Hybrid Journal   (Followers: 2)
Algorithmic Operations Research     Open Access   (Followers: 5)
Algorithms     Open Access   (Followers: 11)
Algorithms Research     Open Access   (Followers: 1)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 8)
American Journal of Mathematical Analysis     Open Access  
American Journal of Mathematics     Full-text available via subscription   (Followers: 6)
American Journal of Operations Research     Open Access   (Followers: 6)
An International Journal of Optimization and Control: Theories & Applications     Open Access   (Followers: 11)
Anadol University Journal of Science and Technology B : Theoritical Sciences     Open Access  
Analele Universitatii Ovidius Constanta - Seria Matematica     Open Access  
Analysis and Applications     Hybrid Journal   (Followers: 1)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 6)
Analysis Mathematica     Full-text available via subscription  
Analysis. International mathematical journal of analysis and its applications     Hybrid Journal   (Followers: 3)
Annales Mathematicae Silesianae     Open Access   (Followers: 2)
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4)
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: 4)
Annals of Data Science     Hybrid Journal   (Followers: 13)
Annals of Discrete Mathematics     Full-text available via subscription   (Followers: 7)
Annals of Mathematics     Full-text available via subscription   (Followers: 2)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 12)
Annals of PDE     Hybrid Journal  
Annals of Pure and Applied Logic     Open Access   (Followers: 4)
Annals of the Alexandru Ioan Cuza University - Mathematics     Open Access  
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1)
Annals of West University of Timisoara - Mathematics     Open Access  
Annals of West University of Timisoara - Mathematics and Computer Science     Open Access   (Followers: 1)
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: 2)
Applications of Mathematics     Hybrid Journal   (Followers: 3)
Applied Categorical Structures     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 14)
Applied Mathematics     Open Access   (Followers: 4)
Applied Mathematics     Open Access   (Followers: 8)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 10)
Applied Mathematics - A Journal of Chinese Universities     Hybrid Journal   (Followers: 1)
Applied Mathematics and Nonlinear Sciences     Open Access  
Applied Mathematics Letters     Full-text available via subscription   (Followers: 4)
Applied Mathematics Research eXpress     Hybrid Journal   (Followers: 1)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 6)
Arab Journal of Mathematical Sciences     Open Access   (Followers: 4)
Arabian Journal of Mathematics     Open Access   (Followers: 2)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 3)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 6)
Archive of Numerical Software     Open Access  
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 6)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
Armenian Journal of Mathematics     Open Access   (Followers: 1)
Arnold Mathematical Journal     Hybrid Journal   (Followers: 1)
Artificial Satellites     Open Access   (Followers: 25)
Asia-Pacific Journal of Operational Research     Hybrid Journal   (Followers: 3)
Asian Journal of Algebra     Open Access   (Followers: 1)
Asian-European Journal of Mathematics     Hybrid Journal   (Followers: 3)
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: 2)
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: 1)
Basin Research     Hybrid Journal   (Followers: 5)
BIBECHANA     Open Access   (Followers: 2)
Biomath     Open Access  
BIT Numerical Mathematics     Hybrid Journal   (Followers: 1)
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   (Followers: 2)
British Journal of Mathematical and Statistical Psychology     Full-text available via subscription   (Followers: 20)
Bruno Pini Mathematical Analysis Seminar     Open Access  
Buletinul Academiei de Stiinte a Republicii Moldova. Matematica     Open Access   (Followers: 13)
Bulletin des Sciences Mathamatiques     Full-text available via subscription   (Followers: 4)
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: 2)
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  
Calculus of Variations and Partial Differential Equations     Hybrid Journal  
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   (Followers: 1)
Catalysis in Industry     Hybrid Journal   (Followers: 1)
CEAS Space Journal     Hybrid Journal   (Followers: 2)
CHANCE     Hybrid Journal   (Followers: 5)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chaos, Solitons & Fractals : X     Open Access  
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  
Clean Air Journal     Full-text available via subscription   (Followers: 1)
Cogent Mathematics     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 3)
Collectanea Mathematica     Hybrid Journal  
COMBINATORICA     Hybrid Journal  
Combinatorics, Probability and Computing     Hybrid Journal   (Followers: 4)
Combustion Theory and Modelling     Hybrid Journal   (Followers: 15)
Commentarii Mathematici Helvetici     Hybrid Journal  
Communications in Advanced Mathematical Sciences     Open Access  
Communications in Combinatorics and Optimization     Open Access  
Communications in Contemporary Mathematics     Hybrid Journal  
Communications in Mathematical Physics     Hybrid Journal   (Followers: 4)
Communications On Pure & Applied Mathematics     Hybrid Journal   (Followers: 4)
Complex Analysis and its Synergies     Open Access   (Followers: 3)
Complex Variables and Elliptic Equations: An International Journal     Hybrid Journal  
Composite Materials Series     Full-text available via subscription   (Followers: 9)
Compositio Mathematica     Full-text available via subscription  
Comptes Rendus Mathematique     Full-text available via subscription  
Computational and Applied Mathematics     Hybrid Journal   (Followers: 4)
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 2)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 2)
Computational Complexity     Hybrid Journal   (Followers: 4)
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 10)
Computational Mechanics     Hybrid Journal   (Followers: 5)
Computational Methods and Function Theory     Hybrid Journal  
Computational Optimization and Applications     Hybrid Journal   (Followers: 8)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 11)
Concrete Operators     Open Access   (Followers: 5)
Confluentes Mathematici     Hybrid Journal  
Contributions to Game Theory and Management     Open Access  
COSMOS     Hybrid Journal  
Cryptography and Communications     Hybrid Journal   (Followers: 13)
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   (Followers: 1)
Demographic Research     Open Access   (Followers: 15)
Demonstratio Mathematica     Open Access  
Dependence Modeling     Open Access  
Design Journal : An International Journal for All Aspects of Design     Hybrid Journal   (Followers: 31)
Developments in Clay Science     Full-text available via subscription   (Followers: 1)
Developments in Mineral Processing     Full-text available via subscription   (Followers: 3)
Dhaka University Journal of Science     Open Access  
Differential Equations and Dynamical Systems     Hybrid Journal   (Followers: 4)
Differentsial'nye Uravneniya     Open Access  
Digital Experiences in Mathematics Education     Hybrid Journal  
Discrete Mathematics     Hybrid Journal   (Followers: 8)
Discrete Mathematics & Theoretical Computer Science     Open Access  
Discrete Mathematics, Algorithms and Applications     Hybrid Journal   (Followers: 2)
Discussiones Mathematicae - General Algebra and Applications     Open Access  
Discussiones Mathematicae Graph Theory     Open Access   (Followers: 2)
Diskretnaya Matematika     Full-text available via subscription  
Dnipropetrovsk University Mathematics Bulletin     Open Access  
Doklady Akademii Nauk     Open Access  
Doklady Mathematics     Hybrid Journal  

        1 2 3 4 | Last

Similar Journals
Journal Cover
Collectanea Mathematica
Number of Followers: 0  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0010-075 - ISSN (Online) 2038-4815
Published by Springer-Verlag Homepage  [2562 journals]
  • Weighted estimates for bilinear fractional integral operators: a necessary
           and sufficient condition for power weights
    • Abstract: We consider weighted estimates for two bilinear fractional integral operators \(I_{2,\alpha }\) and \(BI_{\alpha }\) . Moen (Collect Math 60:213–238, 2009) obtained a necessary and sufficient condition for \(I_{2,\alpha }\) . However we know only some sufficient conditions for \(BI_{\alpha }\) which is a variant of the bilinear Hilbert transform. Restricted to power weights we obtain a necessary and sufficient condition for \(BI_{\alpha }\) . We also prove a bilinear Stein–Weiss inequality.
      PubDate: 2019-03-14
       
  • On jet schemes of pfaffian ideals
    • Abstract: Jet schemes and arc spaces received quite a lot of attention by researchers after their introduction, due to J. Nash, and established their importance as an object of study in M. Kontsevich’s motivic integration theory. Several results point out that jet schemes carry a rich amount of geometrical information about the original object they stem from, whereas, from an algebraic point of view, little is know about them. In this paper we study some algebraic properties of jet schemes ideals of pfaffian varieties and we determine under which conditions the corresponding jet scheme varieties are irreducible.
      PubDate: 2019-02-28
       
  • On the set of local extrema of a subanalytic function
    • Abstract: Let \({\mathfrak {F}}\) be a category of subanalytic subsets of real analytic manifolds that is closed under basic set-theoretical operations (locally finite unions, difference and product) and basic topological operations (taking connected components and closures). Let M be a real analytic manifold and denote \({\mathfrak {F}}(M)\) the family of the subsets of M that belong to the category \({\mathfrak {F}}\) . Let \(f:X\rightarrow \mathbb {R}\) be a subanalytic function on a subset \(X\in {\mathfrak {F}}(M)\) such that the inverse image under f of each interval of \(\mathbb {R}\) belongs to \({\mathfrak {F}}(M)\) . Let \(\mathrm{Max}(f)\) be the set of local maxima of f and consider its level sets \(\mathrm{Max}_\lambda (f):=\mathrm{Max}(f)\cap \{f=\lambda \}=\{f=\lambda \}{\setminus }{\text {Cl}}(\{f>\lambda \})\) for each \(\lambda \in \mathbb {R}\) . In this work we show that if f is continuous, then \(\mathrm{Max}(f)=\bigsqcup _{\lambda \in \mathbb {R}}\mathrm{Max}_\lambda (f)\in {\mathfrak {F}}(M)\) if and only if the family \(\{\mathrm{Max}_\lambda (f)\}_{\lambda \in \mathbb {R}}\) is locally finite in M. If we erase continuity condition, there exist subanalytic functions \(f:X\rightarrow M\) such that \(\mathrm{Max}(f)\in {\mathfrak {F}}(M)\) , but the family \(\{\mathrm{Max}_\lambda (f)\}_{\lambda \in \mathbb {R}}\) is not locally finite in M or such that \(\mathrm{Max}(f)\) is connected but it is not even subanalytic. We show in addition that if \({\mathfrak {F}}\) is the category of subanalytic sets and \(f:X\rightarrow \mathbb {R}\) is a (non-necessarily continuous) subanalytic map f that maps relatively compact subsets of M contained in X to bounded subsets of \(\mathbb {R}\) , then \(\mathrm{Max}(f)\in {\mathfrak {F}}(M)\) and the family \(\{\mathrm{Max}_\lambda (f)\}_{\lambda \in \mathbb {R}}\) is locally finite in M. An example of this type of functions are continuous subanalytic functions on closed subanalytic subsets of M. The previous results imply that if \({\mathfrak {F}}\) is either the category of semianalytic sets or the category of C-semianalytic sets and f is the restriction to an \({\mathfrak {F}}\) -subset of M of a...
      PubDate: 2019-02-22
       
  • Linear functions and duality on the infinite polytorus
    • Abstract: We consider the following question: are there exponents \(2<p<q\) such that the Riesz projection is bounded from \(L^q\) to \(L^p\) on the infinite polytorus' We are unable to answer the question, but our counter-example improves a result of Marzo and Seip by demonstrating that the Riesz projection is unbounded from \(L^\infty \) to \(L^p\) if \(p\ge 3.31138\) . A similar result can be extracted for any \(q>2\) . Our approach is based on duality arguments and a detailed study of linear functions. Some related results are also presented.
      PubDate: 2019-02-02
       
  • On the local integrability condition for generalised translation-invariant
           systems
    • Abstract: This paper considers the local integrability condition for generalised translation-invariant systems and its relation to the Calderón integrability condition, the temperateness condition and the uniform counting estimate. It is shown that sufficient and necessary conditions for satisfying the local integrability condition are closely related to lower and upper bounds on the number of lattice points that intersect with the translates of a compact set. The results are complemented by examples that illustrate the crucial interplay between the translation subgroups and the generating functions of the system.
      PubDate: 2019-02-01
       
  • Rough maximal bilinear singular integrals
    • Abstract: We study the rough maximal bilinear singular integral $$\begin{aligned} T^{*}_\varOmega (f,g)(x)=\! \sup _{\varepsilon >0}\left \int _{\mathbb {R}^{n}\setminus B\left( 0,\varepsilon \right) }\! \int _{\mathbb {R}^{n}\setminus B\left( 0,\varepsilon \right) }\!\frac{ \varOmega ((y,z)/ (y,z) )}{ (y,z) ^{2n}}f(x-y)g(x-z) dydz\right , \end{aligned}$$ where \(\varOmega \) is a function in \(L^\infty (\mathbb S^{2n-1})\) with vanishing integral. We prove it is bounded from \(L^p\times L^q\rightarrow L^r,\) where \(1<p,q<\infty \) and \(1/r=1/p+1/q.\) We also discuss results for \(\varOmega \in L^s(\mathbb S^{2n-1}),\) \(1<s<\infty \) .
      PubDate: 2019-01-31
       
  • On the depth and Stanley depth of the integral closure of powers of
           monomial ideals
    • Abstract: Let \({\mathbb {K}}\) be a field and \(S={\mathbb {K}}[x_1,\ldots ,x_n]\) be the polynomial ring in n variables over \({\mathbb {K}}\) . For any monomial ideal I, we denote its integral closure by \({\overline{I}}\) . Assume that G is a graph with edge ideal I(G). We prove that the modules \(S/\overline{I(G)^k}\) and \(\overline{I(G)^k}/\overline{I(G)^{k+1}}\) satisfy Stanley’s inequality for every integer \(k\gg 0\) . If G is a non-bipartite graph, we show that the ideals \(\overline{I(G)^k}\) satisfy Stanley’s inequality for all \(k\gg 0\) . For every connected bipartite graph G (with at least one edge), we prove that \(\mathrm{sdepth}(I(G)^k)\ge 2\) , for any positive integer \(k\le \mathrm{girth}(G)/2+1\) . This result partially answers a question asked in Seyed Fakhari (J Algebra 489:463–474, 2017). For any proper monomial ideal I of S, it is shown that the sequence \(\{\mathrm{depth}(\overline{I^k}/\overline{I^{k+1}})\}_{k=0}^{\infty }\) is convergent and \(\lim _{k\rightarrow \infty }\mathrm{depth}(\overline{I^k}/\overline{I^{k+1}})=n-\ell (I)\) , where \(\ell (I)\) denotes the analytic spread of I. Furthermore, it is proved that for any monomial ideal I, there exists an integer s such that $$\begin{aligned} \mathrm{depth} (S/I^{sm}) \le \mathrm{depth} (S/{\overline{I}}), \end{aligned}$$ for every integer \(m\ge 1\) . We also determine a value s for which the above inequality holds. If I is an integrally closed ideal, we show that \(\mathrm{depth}(S/I^m)\le \mathrm{depth}(S/I)\) , for every integer \(m\ge 1\) . As a consequence, we obtain that for any integrally closed monomial ideal I and any integer \(m\ge 1\) , we have \(\mathrm{Ass}(S/I)\subseteq \mathrm{Ass}(S/I^m)\) .
      PubDate: 2019-01-28
       
  • Tangent cones of monomial curves obtained by numerical duplication
    • Abstract: Given a numerical semigroup ring \(R=k\llbracket S\rrbracket \) , an ideal E of S and an odd element \(b \in S\) , the numerical duplication \(S \bowtie ^b E\) is a numerical semigroup, whose associated ring \(k\llbracket S \bowtie ^b E\rrbracket \) shares many properties with the Nagata’s idealization and the amalgamated duplication of R along the monomial ideal \(I=(t^e \mid e\in E)\) . In this paper we study the associated graded ring of the numerical duplication characterizing when it is Cohen–Macaulay, Gorenstein or complete intersection. We also study when it is a homogeneous numerical semigroup, a property that is related to the fact that a ring has the same Betti numbers of its associated graded ring. On the way we also characterize when \(\mathrm{gr}_{\mathfrak {m}}(I)\) is Cohen–Macaulay and when \(\mathrm{gr}_{\mathfrak {m}}(\omega _R)\) is a canonical module of \(\mathrm{gr}_{\mathfrak {m}}(R)\) in terms of numerical semigroup’s properties, where \(\omega _R\) is a canonical module of R.
      PubDate: 2019-01-24
       
  • Atomic and maximal function characterizations of Musielak–Orlicz–Hardy
           spaces associated to non-negative self-adjoint operators on spaces of
           homogeneous type
    • Abstract: Let \({\mathcal {X}}\) be a metric space with doubling measure and L be a non-negative self-adjoint operator on \(L^2({\mathcal {X}})\) whose heat kernels satisfy the Gaussian upper bound estimates. Assume that the growth function \(\varphi :\ {\mathcal {X}}\times [0,\infty ) \rightarrow [0,\infty )\) satisfies that \(\varphi (x,\cdot )\) is an Orlicz function and \(\varphi (\cdot ,t)\in {{\mathbb {A}}}_{\infty }({\mathcal {X}})\) (the class of uniformly Muckenhoupt weights). Let \(H_{\varphi ,\,L}({\mathcal {X}})\) be the Musielak–Orlicz–Hardy space defined via the Lusin area function associated with the heat semigroup of L. In this article, the authors characterize the space \(H_{\varphi ,\,L}({\mathcal {X}})\) by means of atoms, non-tangential and radial maximal functions associated with L. In particular, when \(\mu ({\mathcal {X}})<\infty \) , the local non-tangential and radial maximal function characterizations of \(H_{\varphi ,\,L}({\mathcal {X}})\) are obtained. As applications, the authors obtain various maximal function and the atomic characterizations of the “geometric” Musielak–Orlicz–Hardy spaces \(H_{\varphi ,\,r}(\Omega )\) and \(H_{\varphi ,\,z}(\Omega )\) on the strongly Lipschitz domain \(\Omega \) in \({\mathbb {R}}^n\) associated with second-order self-adjoint elliptic operators with the Dirichlet and the Neumann boundary conditions; even when \(\varphi (x,t):=t\) for any \(x\in {\mathbb {R}}^n\) and \(t\in [0,\infty )\) , the equivalent characterizations of \(H_{\varphi ,\,z}(\Omega )\) given in this article improve the known results via removing the assumption that \(\Omega \) is unbounded.
      PubDate: 2019-01-09
       
  • Comparison theorems for deformation functors via invariant theory
    • Abstract: We compare deformations of algebras to deformations of schemes in the setting of invariant theory. Our results generalize comparison theorems of Schlessinger and the second author for projective schemes. We consider deformations (abstract and embedded) of a scheme X which is a good quotient of a quasi-affine scheme \(X^\prime \) by a linearly reductive group G and compare them to invariant deformations of an affine G-scheme containing \(X^\prime \) as an open invariant subset. The main theorems give conditions for when the comparison morphisms are smooth or isomorphisms.
      PubDate: 2019-01-01
       
  • The diameter of the zero-divisor graph of an amalgamated algebra
    • Abstract: Let R and S be commutative rings with unity, \(f:R\rightarrow S\) a ring homomorphism and J an ideal of S. Then the subring \(R\bowtie ^fJ:=\{(r,f(r)+j)\mid r\in R\) and \(j\in J\}\) of \(R\times S\) is called the amalgamation of R with S along J with respect to f. In this paper we generalize and improve recent results on the computation of the diameter of the zero-divisor graph of amalgamated algebras and obtain new results. In particular, we characterize the diameter of the zero-divisor graph of amalgamated duplication.
      PubDate: 2018-12-01
       
  • Hardy inequality and trace Hardy inequality for Dunkl gradient
    • Abstract: We prove Hardy and trace Hardy inequality for Dunkl gradient. We also obtain fractional Hardy inequality with homogeneous and non-homogeneous weight. Hardy type inequalities are also proved for upper half space and cone.
      PubDate: 2018-11-23
       
  • Generic trilinear multipliers associated to degenerate simplexes
    • Authors: Robert Kesler
      Abstract: For each \(1 \le p \le \infty \) , let \(W_{p}(\mathbb {R}) = \left\{ f \in L^p(\mathbb {R}): \hat{f} \in L^{p^\prime }(\mathbb {R}) \right\} \) be equipped with the norm \( f _{W_{p}(\mathbb {R})} = \left \hat{f}\right _{L^{p^\prime }(\mathbb {R})}\) . Moreover, let \(a_1,a_2 : \mathbb {R}^2 \rightarrow \mathbb {C}\) satisfy the condition that for all \(\mathbf {\alpha } \in \mathbb {Z}_{ \ge 0}^2\) there is \(C_{a_1, a_2,\mathbf {\alpha }}>0\) such that for all \(\mathbf {\xi } \in \mathbb {R}^2\) and \(j \in \{1,2\}\) , \(\left \partial ^{\mathbf {\alpha }} a_j (\mathbf {\xi })\right \le \frac{C_{a_1, a_2,\mathbf {\alpha }}}{dist(\mathbf {\xi }, \varGamma )^{ \mathbf {\alpha } }}\) . Our main result is that the trilinear multiplier given on \(\mathcal {S}(\mathbb {R})^3\) by $$\begin{aligned} B[a_1, a_2] : (f_1, f_2, f_3) \mapsto \int _{\mathbb {R}^3} a_1(\xi _1, \xi _2) a_2(\xi _2, \xi _3) \left[ \prod _{j=1}^3 \hat{f_j} (\xi _j) e^{2 \pi ix \xi _j} \right] d\xi _1 d\xi _2 d\xi _3 \end{aligned}$$ extends to a bounded map from \(L^{p_1}(\mathbb {R}) \times W_{p_2}(\mathbb {R}) \times L^{p_3}(\mathbb {R})\) into \(L^{\frac{1}{\frac{1}{p_1} + \frac{1}{p _2} +\frac{1}{p_3}}}(\mathbb {R})\) provided $$\begin{aligned} 1< p_1, p_3< \infty , \frac{1}{p_1} + \frac{1}{p_2}<1, \frac{1}{p_2} + \frac{1}{p_3}<1, 2< p_2 < \infty . \end{aligned}$$
      PubDate: 2018-05-04
      DOI: 10.1007/s13348-018-0224-z
       
  • Duality of central Herz–Morrey–Musielak–Orlicz spaces of
           variable exponents
    • Authors: Fumi-Yuki Maeda; Yoshihiro Mizuta; Takao Ohno; Tetsu Shimomura
      Abstract: Our aim in this paper is to establish duality of central Herz-Morrey-Musielak-Orlicz spaces \(\mathcal {H}^{\Phi ,q(\cdot ),\omega }(\mathbf{R}^N_0)\) of variable exponents, the space \(\underline{\mathcal {H}}^{\Phi ,q(\cdot ),\omega }(\mathbf{R}^N_0)\) and its complementary space \(\overline{\mathcal {H}}^{\Phi ,q(\cdot ),\omega }(\mathbf{R}^N_0)\) by studying the associate spaces of central Herz-Morrey-Musielak-Orlicz spaces \(\mathcal {H}^{\Phi ,q_1,q_2,\omega }(\mathbf{R}^N_0)\) , the space \(\underline{\mathcal {H}}^{\Phi ,q_1,q_2,\omega }(\mathbf{R}^N_0)\) and its complementary space \(\overline{\mathcal {H}}^{\Phi ,q_1,q_2,\omega }(\mathbf{R}^N_0)\) .
      PubDate: 2018-04-20
      DOI: 10.1007/s13348-018-0222-1
       
  • Non-surjective Gaussian maps for singular curves on K3 surfaces
    • Authors: Claudio Fontanari; Edoardo Sernesi
      Abstract: Let (S, L) be a polarized K3 surface with \(\mathrm {Pic}(S) = \mathbb {Z}[L]\) and \(L\cdot L=2g-2\) , let C be a nonsingular curve of genus \(g-1\) and let \(f:C\rightarrow S\) be such that \(f(C) \in \vert L \vert \) . We prove that the Gaussian map \(\Phi _{\omega _C(-T)}\) is non-surjective, where T is the degree two divisor over the singular point x of f(C). This generalizes a result of Kemeny with an entirely different proof. It uses the very ampleness of C on the blown-up surface \(\widetilde{S}\) of S at x and a theorem of L’vovski.
      PubDate: 2018-04-17
      DOI: 10.1007/s13348-018-0223-0
       
  • Weighted inequalities for integral operators on Lebesgue and $$BMO^{\gamma
           }(\omega )$$ B M O γ ( ω ) spaces
    • Authors: Elida V. Ferreyra; Guillermo J. Flores
      Abstract: We characterize the power weights \(\omega \) for which the fractional type operator \(T_{\alpha ,\beta }\) is bounded from \(L^p (\omega ^p)\) into \(L^q (\omega ^q)\) for \(1< p < n/(n- (\alpha + \beta ))\) and \(1/q = 1/p - (n- (\alpha + \beta ))/n\) . If \(n/(n-(\alpha + \beta )) \le p < n/(n -(\alpha +\beta ) -1)^{+}\) we prove that \(T_{\alpha ,\beta }\) is bounded from a weighted weak \(L^p\) space into a suitable weighted \(BMO^\delta \) space for weights satisfying a doubling condition and a reverse Hölder condition. Also, we prove the boundedness of \(T_{\alpha ,\beta }\) from a weighted local space \(BMO_{0}^{\gamma }\) into a weighted \(BMO^\delta \) space, for weights satisfying a doubling condition.
      PubDate: 2018-04-16
      DOI: 10.1007/s13348-018-0221-2
       
  • Uniform rotundity in every direction of Orlicz function spaces equipped
           with the p -Amemiya norm
    • Authors: Radosław Kaczmarek
      Abstract: Some conditions which guarantee that the Orlicz function spaces equipped with the p-Amemiya norm ( \(1<p<\infty \) ) and generated by N-functions are uniformly rotund in every direction are given. Obtained result broaden the knowledge about this notion in Orlicz function spaces with the p-Amemiya norm ( \(1\le p\le \infty \) ).
      PubDate: 2018-03-26
      DOI: 10.1007/s13348-018-0220-3
       
  • Non-elementary Fano conic bundles
    • Authors: E. A. Romano
      Abstract: Let X be a complex, projective, smooth and Fano variety. We study Fano conic bundles \(f:X\rightarrow Y\) . Denoting by \(\rho _{X}\) the Picard number of X, we investigate such contractions when \(\rho _{X}-\rho _{Y}>1\) , called non-elementary. We prove that \(\rho _{X}-\rho _{Y}\le 8\) , and we deduce new geometric information about our varieties X and Y, depending on \(\rho _{X}-\rho _{Y}\) . Using our results, we show that some known examples of Fano conic bundles are elementary. Moreover, when we allow that X is locally factorial with canonical singularities and with at most finitely many non-terminal points, and \(f:X\rightarrow Y\) is a fiber type \(K_{X}\) -negative contraction with one-dimensional fibers, we show that \(\rho _{X}-\rho _{Y}\le 9\) .
      PubDate: 2018-03-12
      DOI: 10.1007/s13348-018-0218-x
       
  • A bound on the dimension of a totally geodesic submanifold in the Prym
           locus
    • Authors: Elisabetta Colombo; Paola Frediani
      Abstract: We give an upper bound for the dimension of a germ of a totally geodesic submanifold, and hence of a Shimura variety of \({{\mathcal {A}}}_{g-1}\) , contained in the Prym locus. First we give such a bound for a germ passing through a Prym variety of a k-gonal curve in terms of the gonality k. Then we deduce a bound only depending on the genus g.
      PubDate: 2018-03-02
      DOI: 10.1007/s13348-018-0215-0
       
  • Mean Lipschitz spaces and a generalized Hilbert operator
    • Authors: Noel Merchán
      Abstract: If \(\mu \) is a positive Borel measure on the interval [0, 1) we let \(\mathcal {H}_\mu \) be the Hankel matrix \(\mathcal {H}_\mu =(\mu _{n, k})_{n,k\ge 0}\) with entries \(\mu _{n, k}=\mu _{n+k}\) , where, for \(n\,=\,0, 1, 2, \dots \) , \(\mu _n\) denotes the moment of order n of \(\mu \) . This matrix induces formally the operator $$\begin{aligned}\mathcal {H}_\mu (f)(z)= \sum _{n=0}^{\infty }\left( \sum _{k=0}^{\infty } \mu _{n,k}{a_k}\right) z^n\end{aligned}$$ on the space of all analytic functions \(f(z)=\sum _{k=0}^\infty a_kz^k\) , in the unit disc \({\mathbb {D}}\) . This is a natural generalization of the classical Hilbert operator. In this paper we study the action of the operators \(\mathcal {H}_\mu \) on mean Lipschitz spaces of analytic functions.
      PubDate: 2018-02-28
      DOI: 10.1007/s13348-018-0217-y
       
 
 
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