Subjects -> MATHEMATICS (Total: 1111 journals)     - APPLIED MATHEMATICS (89 journals)    - GEOMETRY AND TOPOLOGY (23 journals)    - MATHEMATICS (818 journals)    - MATHEMATICS (GENERAL) (45 journals)    - NUMERICAL ANALYSIS (25 journals)    - PROBABILITIES AND MATH STATISTICS (111 journals) MATHEMATICS (818 journals)            First | 1 2 3 4 5
 Showing 401 - 538 of 538 Journals sorted alphabetically Journal of Computational Physics : X       (Followers: 1) Journal of Computer Engineering, System and Science (CESS) Journal of Contemporary Mathematical Analysis Journal of Cryptology       (Followers: 5) Journal of Difference Equations and Applications Journal of Differential Equations       (Followers: 1) Journal of Discrete Algorithms       (Followers: 4) Journal of Discrete Mathematics       (Followers: 1) Journal of Dynamics and Differential Equations Journal of Engineering Mathematics       (Followers: 2) Journal of Evolution Equations Journal of Experimental Algorithmics       (Followers: 1) Journal of Flood Risk Management       (Followers: 14) Journal of Formalized Reasoning       (Followers: 2) Journal of Function Spaces Journal of Functional Analysis       (Followers: 2) Journal of Geochemical Exploration       (Followers: 1) Journal of Geological Research       (Followers: 1) Journal of Geovisualization and Spatial 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Similar Journals
 Monatshefte fur MathematikJournal Prestige (SJR): 0.773 Citation Impact (citeScore): 1Number of Followers: 0      Hybrid journal (It can contain Open Access articles) ISSN (Print) 0026-9255 - ISSN (Online) 1436-5081 Published by Springer-Verlag  [2643 journals]
• Continuum branch of one-signed periodic solutions of first-order
functional equations involving the nonlinearity with zeros
• Abstract: Abstract In this paper, the authors establish the global structure of one-signed periodic solutions of the first-order functional differential equation \begin{aligned} u'(t)=a(t)u(t)-\lambda f(t,u(t-\tau (t))),\qquad t\in \mathbb {R} \end{aligned} by using unilateral bifurcation theorem, where the nonlinearity $$f\in C(\mathbb {R}\times \mathbb {R},\ \mathbb {R})$$ is T-periodic with first variable and having nontrivial zeros, $$a\in C(\mathbb {R},[0,\ \infty ))$$ is T-periodic function with $$\int _{0}^{T}a(t)dt>0$$ , $$\tau \in C(\mathbb {R},\mathbb {R})$$ is T-periodic function, $$\lambda >0$$ is a parameter.
PubDate: 2019-03-21
DOI: 10.1007/s00605-019-01286-6

• Linear bounds for the normal covering number of the symmetric and
alternating groups
• Abstract: Abstract The normal covering number $$\gamma (G)$$ of a finite, non-cyclic group G is the minimum number of proper subgroups such that each element of G lies in some conjugate of one of these subgroups. We find lower bounds linear in n for $$\gamma (S_n)$$ , when n is even, and for $$\gamma (A_n)$$ , when n is odd.
PubDate: 2019-03-20
DOI: 10.1007/s00605-019-01287-5

• Characterizations of democratic systems of translates on locally compact
abelian groups
• Abstract: Abstract We present characterizations of democratic property for systems of translates on a general locally compact abelian group, along a lattice in that group.. That way we generalize the results from Hernández et al. (J Approx Theory 171:105–127, 2013) on systems of integer translates. Furthermore, we investigate the possibilities of more operative characterizations for lattices with torsion group structure, mainly through examples and counterexamples.
PubDate: 2019-03-19
DOI: 10.1007/s00605-019-01285-7

• Prime powers in sums of terms of binary recurrence sequences
• Abstract: Abstract Let $$(u_{n})_{n \ge 0}$$ be a non-degenerate binary recurrence sequence with positive discriminant and p be a fixed prime number. In this paper, we are interested in finding a finiteness result for the solutions of the Diophantine equation $$u_{n_{1}} + u_{n_{2}} + \cdots + u_{n_{t}} = p^{z}$$ with $$n_1> n_2> \cdots > n_t\ge 0$$ . Moreover, we explicitly find all the powers of three which are sums of three balancing numbers using lower bounds for linear forms in logarithms. Further, we use a variant of the Baker–Davenport reduction method in Diophantine approximation due to Dujella and Pethő.
PubDate: 2019-03-16
DOI: 10.1007/s00605-019-01282-w

• Divergence points of self-conformal measures
• Abstract: Abstract In this article, let $$\mu$$ be a self-conformal measure, we discuss the dimensions of divergence points of self-conformal measures with the open set condition. Our main result is that the set $$\{x\in \mathrm{{{\,\mathrm{supp}\,}}}\mu : A(\frac{\log \mu (B(x,r))}{\log r})=I\}$$ is not Taylor fractal and the set $$\{x\in \mathrm{{{\,\mathrm{supp}\,}}}\mu : A(\frac{\log \mu (B(x,r))}{\log r})\subseteq I\}$$ is Taylor fractal.
PubDate: 2019-03-14
DOI: 10.1007/s00605-019-01283-9

• Landau–Bloch type theorems for strongly bounded harmonic mappings
• Abstract: Abstract In this paper, we first establish the sharp version of Landau–Bloch type theorem for strongly bounded harmonic mappings by considering the Landau–Bloch type theorem of a one-parameter family of holomorphic mappings. Next, we will establish two sharp versions of Landau–Bloch type theorems for certain harmonic mappings. Finally, we also pose several conjectures for the sharp version of Landau–Bloch type theorem for bounded harmonic mappings.
PubDate: 2019-03-14
DOI: 10.1007/s00605-019-01284-8

• On preservation of automatic continuity
• Abstract: Abstract A group G is called automatically continuous if any homomorphism from a completely metrizable or locally compact Hausdorff group to G has open kernel. In this paper, we study preservation of automatic continuity under group-theoretic constructions, focusing mainly on groups of size less than continuum. In particular, we consider group extensions and graph products. As a consequence, we establish automatic continuity of virtually poly-free groups, and hence of non-exceptional spherical Artin groups. On the other hand, we show that if G is automatically continuous, then so is any finitely generated residually G group, hence, for instance, all finitely generated residually free groups are automatically continuous.
PubDate: 2019-03-13
DOI: 10.1007/s00605-019-01281-x

• Sequences of zeros of analytic function spaces and weighted superposition
operators
• Abstract: Abstract We use properties of the sequences of zeros of certain spaces of analytic functions in the unit disc $${\mathbb {D}}$$ to study the question of characterizing the weighted superposition operators which map one of these spaces into another. We also prove that for a large class of Banach spaces of analytic functions in $${\mathbb {D}}$$ , Y, we have that if the superposition operator $$S_\varphi$$ associated to the entire function $$\varphi$$ is a bounded operator from X, a certain Banach space of analytic functions in $$\mathbb D$$ , into Y, then the superposition operator $$S_{\varphi ^\prime }$$ maps X into Y.
PubDate: 2019-03-06
DOI: 10.1007/s00605-019-01279-5

• On the modeling of the flow of the Antarctic Circumpolar Current
• Abstract: Abstract A recent model for the flow of the Antarctic Circumpolar Current, formulated in spherical coordinates as a Dirichlet boundary-value problem for a nonlinear elliptic partial differential equation, reduces for flows with no azimuthal variations to a two-point boundary-value problem for a second-order ordinary differential equation. We provide some general settings for which these apparently simpler solutions are the unique solutions, due to an inherent symmetry of the model.
PubDate: 2019-03-01
DOI: 10.1007/s00605-017-1147-6

• Book reviews
• PubDate: 2019-03-01
DOI: 10.1007/s00605-018-1248-x

• A representation formula of Bernstein operators
• Abstract: Abstract We answer a recent question of Bustamante concerning a representation formula for Bernstein operators.
PubDate: 2019-03-01
DOI: 10.1007/s00605-018-1164-0

• Molecular decomposition and Fourier multipliers for holomorphic Besov and
Triebel–Lizorkin spaces
• Abstract: Abstract Smooth molecular decompositions for holomorphic Besov and Triebel–Lizorkin spaces on the unit disk of the complex plane are constructed. The decompositions are used to obtain a boundedness result for Fourier multipliers. As further applications, we provide equivalent norms for the spaces under consideration, we consider the implications of the results on Hardy and Hardy–Sobolev spaces, and we study boundedness of coefficient multipliers.
PubDate: 2019-03-01
DOI: 10.1007/s00605-018-1251-2

• A coprime action version of a solubility criterion of Deskins
• Abstract: Abstract Let A and G be finite groups of relatively prime orders and suppose that A acts on G via automorphisms. We demonstrate that if G has a maximal A-invariant subgroup M that is nilpotent and the Sylow 2-subgroup of M has class at most 2, then G is soluble. This result extends, in the context of coprime action, a solubility criterion given by W.E. Deskins.
PubDate: 2019-03-01
DOI: 10.1007/s00605-018-1256-x

• Polynomial maps with maximal multiplicity and the special closure
• Abstract: Abstract In this article we characterize the polynomial maps $$F:\mathbb {C}^n\rightarrow \mathbb {C}^n$$ for which $$F^{-1}(0)$$ is finite and their multiplicity $$\mu (F)$$ is equal to $$n!\mathrm V_n(\widetilde{\Gamma }_{+}(F))$$ , where $$\widetilde{\Gamma }_{+}(F)$$ is the global Newton polyhedron of F. As an application, we derive a characterization of those polynomial maps whose multiplicity is maximal with respect to a fixed Newton filtration.
PubDate: 2019-03-01
DOI: 10.1007/s00605-018-1204-9

• Boundary structure of convex sets in the hyperbolic space
• Abstract: Abstract We prove some results concerning the boundary of a convex set in $$\mathbb {H}^n$$ . This includes the convergence of curvature measures under Hausdorff convergence of the sets, the study of normal points, and, for convex surfaces, a generalized Gauss equation and some natural characterizations of the regular part of the Gaussian curvature measure.
PubDate: 2019-03-01
DOI: 10.1007/s00605-018-1194-7

• On monoidal group actions on tensor categories and their Green functors
• Abstract: Abstract In this paper we introduce the notion of a categorical Mackey functor. This categorical notion allows us to obtain new Mackey functors by passing to Quillen’s K-theory of the corresponding abelian categories. In the case of an action by monoidal autoequivalences on a monoidal category the Mackey functor obtained at the level of Grothendieck rings has in fact a Green functor structure.
PubDate: 2019-03-01
DOI: 10.1007/s00605-018-1156-0

• Follower, predecessor, and extender entropies
• Abstract: Abstract Using the follower/predecessor/extender set sequences defined by the first author, we define quantities which we call the follower/predecessor/extender entropies, which can be associated to any shift space. We analyze the behavior of these quantities under conjugacies and factor maps, most notably showing that extender entropy is a conjugacy invariant and that having follower entropy zero is a conjugacy invariant. We give some applications, including examples of shift spaces with equal entropy which can be distinguished by extender entropy, and examples of shift spaces which can be shown to not be isomorphic to their inverse by using follower/predecessor entropy.
PubDate: 2019-03-01
DOI: 10.1007/s00605-018-1224-5

• Characterizations of John spaces
• Abstract: Abstract The main purpose of this paper is to study the characterizations of John spaces. We obtain five equivalent characterizations for length John spaces. As an application, we establish a dimension-free quasisymmetric invariance of length John spaces. This result is new also in the case of the Euclidean space.
PubDate: 2019-03-01
DOI: 10.1007/s00605-018-1231-6

• Solvable groups whose prime divisor character degree graphs are
1-connected
• Abstract: Abstract A cut vertex of a graph is a vertex whose removal causes the resulting graph to have more connected components. We show that the prime divisor character degree graph of a solvable group has at most one cut vertex. We also prove that a solvable group whose prime divisor character degree graph has a cut vertex has at most two normal nonabelian Sylow subgroups. We determine the structures of those solvable groups whose prime divisor character degree graph has a cut vertex and has two normal nonabelian Sylow subgroups. Finally, we characterize a subgroup determined by the prime associated with the cut vertex in terms of the structure of the prime divisor character degree graph.
PubDate: 2019-03-01
DOI: 10.1007/s00605-019-01276-8

• Dimension of generic self-affine sets with holes
• Authors: Henna Koivusalo; Michał Rams
Abstract: Abstract Let $$(\Sigma , \sigma )$$ be a dynamical system, and let $$U\subset \Sigma$$ . Consider the survivor set \begin{aligned} \Sigma _U=\left\{ x\in \Sigma \mid \sigma ^n(x)\notin U\,\text {for all}\,n\right\} \end{aligned} of points that never enter the subset U. We study the size of this set in the case when $$\Sigma$$ is the symbolic space associated to a self-affine set $$\Lambda$$ , calculating the dimension of the projection of $$\Sigma _U$$ as a subset of $$\Lambda$$ and finding an asymptotic formula for the dimension in terms of the Käenmäki measure of the hole as the hole shrinks to a point. Our results hold when the set U is a cylinder set in two cases: when the matrices defining $$\Lambda$$ are diagonal; and when they are such that the pressure is differentiable at its zero point, and the Käenmäki measure is a strong-Gibbs measure.
PubDate: 2018-05-22
DOI: 10.1007/s00605-018-1187-6

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