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 Subjects -> MATHEMATICS (Total: 1051 journals)     - APPLIED MATHEMATICS (85 journals)    - GEOMETRY AND TOPOLOGY (23 journals)    - MATHEMATICS (775 journals)    - MATHEMATICS (GENERAL) (43 journals)    - NUMERICAL ANALYSIS (23 journals)    - PROBABILITIES AND MATH STATISTICS (102 journals) MATHEMATICS (775 journals)                  1 2 3 4 | Last
 Showing 1 - 200 of 538 Journals sorted alphabetically Abakós       (Followers: 5) Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg       (Followers: 4) Academic Voices : A Multidisciplinary Journal       (Followers: 2) Accounting Perspectives       (Followers: 7) ACM Transactions on Algorithms (TALG)       (Followers: 16) ACM Transactions on Computational Logic (TOCL)       (Followers: 3) ACM Transactions on Mathematical Software (TOMS)       (Followers: 6) ACS Applied Materials & Interfaces       (Followers: 38) Acta Applicandae Mathematicae       (Followers: 1) Acta Mathematica       (Followers: 12) Acta Mathematica Hungarica       (Followers: 2) Acta Mathematica Scientia       (Followers: 5) Acta Mathematica Sinica, English Series       (Followers: 6) Acta Mathematica Vietnamica Acta Mathematicae Applicatae Sinica, English Series Advanced Science Letters       (Followers: 12) Advances in Applied Clifford Algebras       (Followers: 4) Advances in Calculus of Variations       (Followers: 6) Advances in Catalysis       (Followers: 5) Advances in Complex Systems       (Followers: 9) Advances in Computational Mathematics       (Followers: 21) Advances in Decision Sciences       (Followers: 3) Advances in Difference Equations       (Followers: 3) Advances in Fixed Point Theory       (Followers: 8) Advances in Geosciences (ADGEO)       (Followers: 18) Advances in Linear Algebra & Matrix Theory       (Followers: 10) Advances in Materials Science       (Followers: 17) Advances in Mathematical Physics       (Followers: 8) Advances in Mathematics       (Followers: 15) Advances in Nonlinear Analysis Advances in Numerical Analysis       (Followers: 7) Advances in Operations Research       (Followers: 12) Advances in Porous Media       (Followers: 5) Advances in Pure and Applied Mathematics       (Followers: 8) Advances in Pure Mathematics       (Followers: 9) Advances in Science and Research (ASR)       (Followers: 6) Aequationes Mathematicae       (Followers: 2) African Journal of Educational Studies in Mathematics and Sciences       (Followers: 7) African Journal of Mathematics and Computer Science Research       (Followers: 5) Afrika Matematika       (Followers: 1) Air, Soil & Water Research       (Followers: 13) AKSIOMA Journal of Mathematics Education       (Followers: 2) Al-Jabar : Jurnal Pendidikan Matematika       (Followers: 1) Algebra and Logic       (Followers: 7) Algebra Colloquium       (Followers: 4) Algebra Universalis       (Followers: 2) Algorithmic Operations Research       (Followers: 5) Algorithms       (Followers: 11) Algorithms Research       (Followers: 1) American Journal of Computational and Applied Mathematics       (Followers: 8) American Journal of Mathematical Analysis American Journal of Mathematical and Management Sciences American Journal of Mathematics       (Followers: 6) American Journal of Operations Research       (Followers: 6) American Mathematical Monthly       (Followers: 6) An International Journal of Optimization and Control: Theories & Applications       (Followers: 11) Anadol University Journal of Science and Technology B : Theoritical Sciences Analele Universitatii Ovidius Constanta - Seria Matematica Analysis and Applications       (Followers: 1) Analysis and Mathematical Physics       (Followers: 6) Analysis Mathematica Analysis. International mathematical journal of analysis and its applications       (Followers: 4) Annales Mathematicae Silesianae       (Followers: 2) Annales mathématiques du Québec       (Followers: 4) Annales Universitatis Mariae Curie-Sklodowska, sectio A – Mathematica       (Followers: 1) Annales Universitatis Paedagogicae Cracoviensis. 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Similar Journals
 Analysis and Mathematical PhysicsJournal Prestige (SJR): 0.536 Citation Impact (citeScore): 1Number of Followers: 6      Hybrid journal (It can contain Open Access articles) ISSN (Print) 1664-2368 - ISSN (Online) 1664-235X Published by Springer-Verlag  [2573 journals]
• Correction to: On Borg’s method for non-selfadjoint
Sturm–Liouville operators
• Abstract: The original version of the article unfortunately contained few errors under Preliminaries section. The corrected text is given below.
PubDate: 2019-12-01

• Correction to: A $${\texttt {p}}({\cdot })$$p(·) -Poincaré-type
inequality for variable exponent Sobolev spaces with zero boundary values
in Carnot groups
• Abstract: In this short note, we remark on the main theorem of Theorem 5.1].
PubDate: 2019-12-01

• A 1-point poly-quadrature domain of order 1 not biholomorphic to a
complete circular domain
• Abstract: Abstract It is known that if $$f: D_1 \rightarrow D_2$$ is a polynomial biholomorphism with polynomial inverse and constant Jacobian then $$D_1$$ is a 1-point poly-quadrature domain (the Bergman span contains all holomorphic polynomials) of order 1 whenever $$D_2$$ is a complete circular domain. Bell conjectured that all 1-point poly-quadrature domains arise in this manner. In this note, we construct a 1-point poly-quadrature domain of order 1 that is not biholomorphic to any complete circular domain.
PubDate: 2019-12-01

• The Cauchy problem for Boussinesq equations with general elliptic part
• Abstract: In this paper, the existence and uniqueness of solution of the Cauchy problem for abstract Boussinesq equation is obtained. The leading part of the equation include general elliptic operator and abstract positive operator in a Banach space E. Since the Banach space E and linear operators are sufficiently large classes, by choosing their we obtain the existence and uniqueness of solution of numerous classes of generalized Boussinesq type equations which occur in a wide variety of physical systems. By applying this result, the Wentzell–Robin type mixed problem for Boussinesq equations and the Cauchy problem for finite or infinite systems of Boussinesq equations are studied.
PubDate: 2019-12-01

• Critical graph of a polynomial quadratic differential related to a
Schrödinger equation with quartic potential
• Abstract: Abstract In this paper, we study the weak asymptotic in the $$\mathbb {C}$$-plane of some wave functions resulting from the WKB-techniques applied to a Schrödinger equation with quartic oscillator and having some boundary condition. As a first step, we make transformations of our problem to obtain a Heun equation satisfied by the polynomial part of the WKB wave functions. Especially, we investigate the properties of the Cauchy transform of the root counting measure of re-scaled solutions of the Schrodinger equation, to obtain a quadratic algebraic equation of the form $${\mathcal {C}}^{2}(z) +r(z){\mathcal {C}}(z)+s(z)=0$$, where r, s are also polynomials. As a second step, we discuss the existence of solutions (in the form of Cauchy transform of a signed measure) of this algebraic equation. It remains to describe the critical graph of a related quadratic differential $$-p(z)dz^{2}$$ where p(z) is a quartic polynomial. In particular, we discuss the existence (and their number) of finite critical trajectories of this quadratic differential.
PubDate: 2019-12-01

• On Borg’s method for non-selfadjoint Sturm–Liouville operators
• Abstract: Abstract We prove local solvability and stability for the inverse problem of recovering a complex-valued square integrable potential in the Sturm–Liouville equation on a finite interval from spectra of two boundary value problems with one common boundary condition. For this purpose we generalize classical Borg’s method to the case of multiple spectra.
PubDate: 2019-12-01

• A Hölder stability estimate for inverse problems for the ultrahyperbolic
Schrödinger equation
• Abstract: Abstract In this article, we first establish a global Carleman estimate for an ultrahyperbolic Schrödinger equation. Next, we prove Hölder stability for the inverse problem of determining a coefficient or a source term in the equation by some lateral boundary data.
PubDate: 2019-12-01

• Decay estimates for the arithmetic means of coefficients connected with
composition operators
• Abstract: Abstract Let $$f\in L^{\infty }(T)$$ with $$\Vert f\Vert _{\infty }\le 1$$. If $$f(0)\ne 0,$$$$n,k\in {\mathbb {Z}}$$, and $$b_{n,n-k}=\int _{E}f(x)^{n}e^{-2\pi i(n-k)x}dx$$, $$E=\{x\in T: f(x) =1\}$$, we prove that the arithmetic means $$\frac{1}{N} \sum _{n=M}^{M+N} b_{n,n-k} ^{2}$$ decay like $$\{\log N\log _{2}N\cdot \cdot \cdot \log _{q}N\}^{-1}$$ as $$N\rightarrow \infty$$, uniformly in $$k\in {\mathbb {Z}}$$.
PubDate: 2019-12-01

• Infinitesimal relative position vector fields for observers in a reference
frame and applications to conformally stationary spacetimes
• Abstract: Abstract We introduce and analyze the concept of infinitesimal relative position vector field between “infinitesimally nearby” observers, showing the equivalence between different definitions. Through the Fermi–Walker derivative of infinitesimal relative position vector fields along an observer in a reference frame, we characterize spacetimes admitting an umbilic foliation. Sufficient and necessary conditions for those spacetimes to be a conformally stationary spacetime are given. Finally, the important class of cosmological models known as generalized Robertson–Walker spacetimes is characterized.
PubDate: 2019-12-01

• Fractional Carleson measure associated with Hermite operator
• Abstract: Abstract Let $$L=-\Delta + x ^2$$ be the Hermite operator, where $$\Delta$$ is the Laplacian on $${\mathbb {R}}^{d}$$. In this paper, we define fractional Carleson measure associated with Hermite operator, which is adapted to the operator L. Then, we will use it to characterize the dual spaces and predual spaces of the Hardy spaces $$H_L^p({\mathbb {R}}^d)$$ associated with L.
PubDate: 2019-12-01

• On automorphisms of graphs and Riemann surfaces acting with fixed points
• Abstract: Abstract Let X be a finite connected graph, possibly with multiple edges. We provide each edge of the graph by two possible orientations. An automorphism group of a graph acts harmonically if it acts freely on the set of directed edges of the graph. Following M. Baker and S. Norine define a genus g of the graph X to be the rank of the first homology group. A finite group acting harmonically on a graph of genus g is a natural discrete analogue of a finite group of automorphisms acting on a Riemann surface of genus g. In the present paper, we give a sharp upper bound for the size of cyclic group acting harmonically on a graph of genus $$g\ge 2$$ with a given number of fixed points. Similar results, for closed orientable surfaces, were obtained earlier by T. Szemberg, I. Farkas and H. M. Kra.
PubDate: 2019-12-01

• Nonlinear singular problems with indefinite potential term
• Abstract: Abstract We consider a nonlinear Dirichlet problem driven by a nonhomogeneous differential operator plus an indefinite potential. In the reaction we have the competing effects of a singular term and of concave and convex nonlinearities. In this paper the concave term will be parametric. We prove a bifurcation-type theorem describing the changes in the set of positive solutions as the positive parameter $$\lambda$$ varies.
PubDate: 2019-12-01

• Titchmarsh–Weyl theory for vector-valued discrete Schrödinger
operators
• Abstract: Abstract We develop the Titchmarsh–Weyl theory for vector-valued discrete Schrödinger operators. We show that the Weyl m functions associated with these operators are matrix valued Herglotz functions that map complex upper half plane to the Siegel upper half space. We discuss about the Weyl disk and Weyl circle corresponding to these operators by defining these functions on a bounded interval. We also discuss the geometric properties of Weyl disk and find the center and radius of the Weyl disk explicitly in terms of matrices.
PubDate: 2019-12-01

• Hyponormal Toeplitz operators with non-harmonic algebraic symbol
• Abstract: Abstract Given a bounded function $$\varphi$$ on the unit disk in the complex plane, we consider the operator $$T_{\varphi }$$, defined on the Bergman space of the disk and given by $$T_{\varphi }(f)=P(\varphi f)$$, where P denotes the orthogonal projection to the Bergman space in $$L^2({\mathbb {D}},dA)$$. For algebraic symbols $$\varphi$$, we provide new necessary conditions on $$\varphi$$ for $$T_{\varphi }$$ to be hyponormal, extending recent results of Fleeman and Liaw. Our approach is perturbative and aims to understand how small changes to a symbol preserve or destroy hyponormality of the corresponding operator. We consider both additive and multiplicative perturbations of a variety of algebraic symbols. One of our main results provides a necessary condition on the complex constant C for the operator $$T_{z^n+C z ^s}$$ to be hyponormal. This condition is also sufficient if $$s\ge 2n$$.
PubDate: 2019-12-01

• Blaschke product for bordered surfaces
• Abstract: Abstract Any ramified holomorphic covering of a closed unit disc by another such a disc is given by a finite Blaschke product. The inverse is also true. In this note we give two explicit constructions for a holomorphic ramified covering of a disc by other bordered Riemann surface. The machinery used here strongly resembles the description of magnetic configurations in submicron planar magnets.
PubDate: 2019-12-01

• Compactness of embedding of generalized higher order Lipschitz classes
• Abstract: Abstract In this paper sufficient conditions for continuous and compact embeddings of generalized higher order Lipschitz classes on a compact subset of n-dimensional real Euclidean spaces are obtained.
PubDate: 2019-12-01

• Exponentially harmonic maps between surfaces
• Abstract: Abstract We show the maximum principle for exponential energy minimizing maps. We then estimate the distance of two image points of an exponentially harmonic map between surfaces. We also study the existence of an exponentially harmonic map between surfaces if the image is contained in a convex disc. We finally investigate the existence of an exponentially harmonic map $$f:M_1\rightarrow M_2$$ between surfaces in case $$\pi _2 (M_2) = \emptyset$$.
PubDate: 2019-12-01

• The inverse problem on Roulettes in normed planes
• Abstract: Abstract We investigate an inverse problem referring to roulettes in normed planes, thus generalizing analogous results of Bloom and Whitt on the Euclidean subcase. More precisely, we prove that a given curve can be traced by rolling another curve along a line if two natural conditions are satisfied. Our access involves details from a metric theory of trigonometric functions, which was recently developed for normed planes. Based on this, our approach differs from other ones in the literature.
PubDate: 2019-09-26

• On the order of strong starlikeness and the radii of starlikeness for of
some close-to-convex functions
• Abstract: Abstract In this paper we show several sufficient conditions for close-to-convex functions to be strongly starlike of some order. The results continue the line of study from the first author’s paper on the order of strong starlikeness of strongly convex functions, (Nunokawa in Proc Japan Acad Ser A 69(7):234–237, 1993). Also it appears an small improvement of a certain classical results of Ch. Pommerenke. As an application, we also derive estimates for the radii of star-likeness for close-to-convex functions.
PubDate: 2019-09-13

• Abundant exact solutions and interaction phenomena of the
(2 + 1)-dimensional YTSF equation
• Abstract: Abstract In this paper, we study abundant exact solutions including the lump and interaction solutions to the (2 + 1)-dimensional Yu–Toda–Sasa–Fukuyama equation. With symbolic computation, lump solutions and the interaction solutions are generated directly based on the Hirota bilinear formulation. Analyticity and well-definedness is guaranteed through some conditions posed on the parameters. With special choices of the involved parameters, the interaction phenomena are simulated and discussed. We find the lump moves from one hump to the other hump of the two-soliton, while the lump separates from the hump of the one-soliton.
PubDate: 2019-09-03

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