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)            First | 1 2 3 4
 Showing 601 - 538 of 538 Journals sorted alphabetically Results in Control and Optimization Results in Mathematics Results in Nonlinear Analysis Review of Symbolic Logic       (Followers: 2) Reviews in Mathematical Physics       (Followers: 1) Revista Baiana de Educação Matemática Revista Bases de la Ciencia Revista BoEM - Boletim online de Educação Matemática Revista Colombiana de Matemáticas       (Followers: 1) Revista de Ciencias Revista de Educación Matemática Revista de la Escuela de Perfeccionamiento en Investigación Operativa Revista de la Real Academia de Ciencias Exactas, Fisicas y Naturales. Serie A. Matematicas Revista de Matemática : Teoría y Aplicaciones       (Followers: 1) Revista Digital: Matemática, Educación e Internet Revista Electrónica de Conocimientos, Saberes y Prácticas Revista Integración : Temas de Matemáticas Revista Internacional de Sistemas Revista Latinoamericana de Etnomatemática Revista Latinoamericana de Investigación en Matemática Educativa Revista Matemática Complutense Revista REAMEC : Rede Amazônica de Educação em Ciências e Matemática Revista SIGMA Ricerche di Matematica RMS : Research in Mathematics & Statistics Royal Society Open Science       (Followers: 7) Russian Journal of Mathematical Physics Russian Mathematics Sahand Communications in Mathematical Analysis Sampling Theory, Signal Processing, and Data Analysis São Paulo Journal of Mathematical Sciences Science China Mathematics       (Followers: 1) Science Progress       (Followers: 1) Sciences & Technologie A : sciences exactes Selecta Mathematica       (Followers: 1) SeMA Journal Semigroup Forum       (Followers: 1) Set-Valued and Variational Analysis SIAM Journal on Applied Mathematics       (Followers: 11) SIAM Journal on Computing       (Followers: 11) SIAM Journal on Control and Optimization       (Followers: 18) SIAM Journal on Discrete Mathematics       (Followers: 8) SIAM Journal on Financial Mathematics       (Followers: 3) SIAM Journal on Mathematics of Data Science       (Followers: 1) SIAM Journal on Matrix Analysis and Applications       (Followers: 3) SIAM Journal on Optimization       (Followers: 12) Siberian Advances in Mathematics Siberian Mathematical Journal Sigmae SILICON SN Partial Differential Equations and Applications Soft Computing       (Followers: 7) Statistics and Computing       (Followers: 14) Stochastic Analysis and Applications       (Followers: 3) Stochastic Partial Differential Equations : Analysis and Computations       (Followers: 2) Stochastic Processes and their Applications       (Followers: 6) Stochastics and Dynamics       (Followers: 2) Studia Scientiarum Mathematicarum Hungarica       (Followers: 1) Studia Universitatis Babeș-Bolyai Informatica Studies In Applied Mathematics       (Followers: 1) Studies in Mathematical Sciences       (Followers: 1) Superficies y vacio Suska Journal of Mathematics Education       (Followers: 1) Swiss Journal of Geosciences       (Followers: 1) Synthesis Lectures on Algorithms and Software in Engineering       (Followers: 2) Synthesis Lectures on Mathematics and Statistics       (Followers: 1) Tamkang Journal of Mathematics Tatra Mountains Mathematical Publications Teaching Mathematics       (Followers: 10) Teaching Mathematics and its Applications: An International Journal of the IMA       (Followers: 4) Teaching Statistics       (Followers: 8) Technometrics       (Followers: 8) The Journal of Supercomputing       (Followers: 1) The Mathematica journal The Mathematical Gazette       (Followers: 1) The Mathematical Intelligencer The Ramanujan Journal The VLDB Journal       (Followers: 2) Theoretical and Mathematical Physics       (Followers: 7) Theory and Applications of Graphs Topological Methods in Nonlinear Analysis Transactions of the London Mathematical Society       (Followers: 1) Transformation Groups Turkish Journal of Mathematics Ukrainian Mathematical Journal Uniciencia Uniform Distribution Theory Unisda Journal of Mathematics and Computer Science Unnes Journal of Mathematics       (Followers: 1) Unnes Journal of Mathematics Education       (Followers: 2) Unnes Journal of Mathematics Education Research       (Followers: 1) Ural Mathematical Journal Vestnik Samarskogo Gosudarstvennogo Tekhnicheskogo Universiteta. Seriya Fiziko-Matematicheskie Nauki Vestnik St. Petersburg University: Mathematics VFAST Transactions on Mathematics       (Followers: 1) Vietnam Journal of Mathematics Vinculum Visnyk of V. N. Karazin Kharkiv National University. Ser. Mathematics, Applied Mathematics and Mechanics       (Followers: 2) Water SA       (Followers: 1) Water Waves Zamm-Zeitschrift Fuer Angewandte Mathematik Und Mechanik       (Followers: 1) ZDM       (Followers: 2) Zeitschrift für angewandte Mathematik und Physik       (Followers: 2) Zeitschrift fur Energiewirtschaft Zetetike

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Similar Journals
 Revista de la Real Academia de Ciencias Exactas, Fisicas y Naturales. Serie A. MatematicasJournal Prestige (SJR): 0.493 Citation Impact (citeScore): 1Number of Followers: 0      Partially Free Journal ISSN (Print) 1578-7303 - ISSN (Online) 1579-1505 Published by Springer-Verlag  [2469 journals]
• On discrete $$L_p$$ L p Brunn–Minkowski type inequalities

Abstract: Abstract $$L_p$$ Brunn–Minkowski type inequalities for the lattice point enumerator $$\mathrm {G}_n(\cdot )$$ are shown, $$p\ge 1$$ , both in a geometrical and in a functional setting. In particular, we prove that \begin{aligned}\mathrm {G}_n\bigl ((1-\lambda )\cdot K +_p \lambda \cdot L + (-1,1)^n\bigr )^{p/n}\ge (1-\lambda )\mathrm {G}_n(K)^{p/n}+\lambda \mathrm {G}_n(L)^{p/n} \end{aligned} for any $$K, L\subset \mathbb {R}^n$$ bounded sets with integer points and all $$\lambda \in (0,1)$$ . We also show that these new discrete analogues (for $$\mathrm {G}_n(\cdot )$$ ) imply the corresponding results concerning the Lebesgue measure.
PubDate: 2022-08-11

• Closed linear spaces consisting of strongly norm attaining Lipschitz
functionals

Abstract: Abstract Given a pointed metric space M, we study when there exist n-dimensional linear subspaces of $$\mathrm {Lip}_0(M)$$ consisting of strongly norm-attaining Lipschitz functionals, for $$n\in {\mathbb {N}}$$ . We show that this is always the case for infinite metric spaces, providing a definitive answer to the question. We also study the possible sizes of such infinite-dimensional closed linear subspaces Y, as well as the inverse question, that is, the possible sizes for a metric space M in order to such a subspace Y exist. We also show that if the metric space M is $$\sigma$$ -precompact, then the aforementioned subspaces Y need to be always separable and isomorphically polyhedral, and we show that for spaces containing [0, 1] isometrically, they can be infinite-dimensional.
PubDate: 2022-08-07

• On C-totally real minimal submanifolds of the Sasakian space forms with
parallel Ricci tensor

Abstract: Abstract Cheng et al. recently (Results Math 76:144, 2021) established a complete classification of the n-dimensional C-totally real minimal submanifolds with constant sectional curvature in the $$(2n+1)$$ -dimensional Sasakian space form $$N^{2n+1}(c)$$ . In this paper, trying to extend the above result, we classify C-totally real minimal submanifolds in $$N^{2n+1}(c)$$ with parallel Ricci tensor for $$n=3,4$$ . In particular, we show that 4-dimensional C-totally real minimal Einstein submanifolds in $$N^9(c)$$ are of constant sectional curvature.
PubDate: 2022-08-07

• Extremal structure in ultrapowers of Banach spaces

Abstract: Abstract Given a bounded convex subset C of a Banach space X and a free ultrafilter $${\mathcal {U}}$$ , we study which points $$(x_i)_{\mathcal {U}}$$ are extreme points of the ultrapower $$C_{\mathcal {U}}$$ in $$X_{\mathcal {U}}$$ . In general, we obtain that when $$\{x_i\}$$ is made of extreme points (respectively denting points, strongly exposed points) and they satisfy some kind of uniformity, then $$(x_i)_{\mathcal {U}}$$ is an extreme point (respectively denting point, strongly exposed point) of $$C_\mathcal U$$ . We also show that every extreme point of $$C_{{\mathcal {U}}}$$ is strongly extreme, and that every point exposed by a functional in $$(X^*)_{{\mathcal {U}}}$$ is strongly exposed, provided that $$\mathcal U$$ is a countably incomplete ultrafilter. Finally, we analyse the extremal structure of $$C_{\mathcal {U}}$$ in the case that C is a super weakly compact or uniformly convex set.
PubDate: 2022-08-06

• Singular solutions for fractional parabolic boundary value problems

Abstract: Abstract The standard problem for the classical heat equation posed in a bounded domain $$\Omega$$ of $${\mathbb {R}}^n$$ is the initial and boundary value problem. If the Laplace operator is replaced by a version of the fractional Laplacian, the initial and boundary value problem can still be solved on the condition that the non-zero boundary data must be singular, i.e., the solution u(t, x) blows up as x approaches $$\partial \Omega$$ in a definite way. In this paper we construct a theory of existence and uniqueness of solutions of the parabolic problem with singular data taken in a very precise sense, and also admitting initial data and a forcing term. When the boundary data are zero we recover the standard fractional heat semigroup. A general class of integro-differential operators may replace the classical fractional Laplacian operators, thus enlarging the scope of the work. As further results on the spectral theory of the fractional heat semigroup, we show that a one-sided Weyl-type law holds in the general class, which was previously known for the restricted and spectral fractional Laplacians, but is new for the censored (or regional) fractional Laplacian. This yields bounds on the fractional heat kernel.
PubDate: 2022-08-01

• Groups as automorphisms of dessins d’enfants

Abstract: Abstract It is known that every finite group can be represented as the full group of automorphisms of a suitable compact dessin d’enfant. In this paper, we give a constructive and easy proof that the same holds for any countable group by considering non-compact dessins. Moreover, we show that any tame action of a countable group is so realisable.
PubDate: 2022-08-01

• Cauchy problem for the Navier–Stokes–Voigt model governing
nonhomogeneous flows

Abstract: Abstract The Navier–Stokes–Voigt model that governs flows with non-constant density of incompressible fluids with elastic properties is considered in the whole space domain $$\mathbb {R}^d$$ and in the entire time interval. If $$d\in \{2,\,3,\,4\}$$ , we prove the existence of weak solutions (velocity, density and pressure) to the associated Cauchy problem. We also analyse some issues of regularity of the weak solutions to the considered problem and the large time behavior in special unbounded domains.
PubDate: 2022-07-28

• On new exponential-type operators

Abstract: Abstract Theory of approximation, concerning linear positive operators is an active area amongst researchers in last six decades. The term exponential-type operators was considered in the year 1978, when Ismail and May captured some operators by considering a partial differential equation, satisfied by the kernel of an operator and associated with different p(x). Since then no new exponential-type operator was introduced by researchers, although many modifications of the existing exponential-type operators were proposed and studied. In the present article we provide alternate methods to construct a large class of exponential-type operators connected with $$p(x)=x^r, 1<r\le 2, r=3$$ . We capture existing operators by our methods and also establish some new operators.
PubDate: 2022-07-27

• On 2MP-, MP2- and C2MP-inverses for rectangular matrices

Abstract: Abstract This paper introduces 2MP-inverses, MP2-inverses, and C2MP-inverses, for rectangular matrices following a different approach to that used in the recent literature. These new inverses generalize some classical inverses in the literature. Instead of considering a system of matrix equations as usually, in order to define 2MP-inverses and MP2-inverses, we consider a construction from oblique projectors represented by means of outer generalized inverses. We use an adequate equivalence relation, and then we pass to the quotient set in order to get the most simple canonical representative. An interesting advantage of our extension of CMP inverses from square to rectangular matrices is that we do not need any auxiliary weight matrix, but we are using the own matrix A for doing it. In addition, some properties and representations of 2MP-, MP2-, and C2MP-inverses are given.
PubDate: 2022-07-23

• The abstract Cauchy problem in locally convex spaces

Abstract: We derive necessary and sufficient criteria for the uniqueness and existence of solutions of the abstract Cauchy problem in locally convex Hausdorff spaces. Our approach is based on a suitable notion of an asymptotic Laplace transform and extends results of Langenbruch beyond the class of Fréchet spaces.
PubDate: 2022-07-22

• Inequalities of Turán-type for algebraic polynomials

Abstract: Abstract In this paper, we establish some new inequalities in the complex plane that are inspired by some classical Turán-type inequalities that relate the norm of a univariate complex coefficient polynomial and its derivative on the unit disk. The obtained results produce various inequalities in the supremum-norm and in the integral-norm of a polynomial that are sharper than the previous ones while taking into account the placement of the zeros and some of the extremal coefficients of the underlying polynomial. Moreover, our results besides derive polar derivative analogues of some classical Turán-type inequalities also include several interesting generalizations and refinements of some integral inequalities for polynomial as well. Some numerical examples are given in order to graphically illustrate and compare the obtained inequalities with some classical results.
PubDate: 2022-07-21

• Isometric structure of transportation cost spaces on finite metric spaces

Abstract: Abstract The paper is devoted to isometric Banach-space-theoretical structure of transportation cost (TC) spaces on finite metric spaces. The TC spaces are also known as Arens-Eells, Lipschitz-free, or Wasserstein spaces. A new notion of a roadmap pertinent to a transportation problem on a finite metric space has been introduced and used to simplify proofs for the results on representation of TC spaces as quotients of $$\ell _1$$ spaces on the edge set over the cycle space. A Tolstoi-type theorem for roadmaps is proved, and directed subgraphs of the canonical graphs, which are supports of maximal optimal roadmaps, are characterized. Possible obstacles for a TC space on a finite metric space X preventing them from containing subspaces isometric to $$\ell _\infty ^n$$ have been found in terms of the canonical graph of X. The fact that TC spaces on diamond graphs do not contain $$\ell _\infty ^4$$ isometrically has been derived. In addition, a short overview of known results on the isometric structure of TC spaces on finite metric spaces is presented.
PubDate: 2022-07-20

• Weak compactness and representation in variable exponent Lebesgue spaces
on infinite measure spaces

Abstract: Abstract Relative weakly compact sets and weak convergence in variable exponent Lebesgue spaces $${L^{p(\cdot )}(\Omega )}$$ for infinite measure spaces $$(\Omega ,\mu )$$ are characterized. Criteria recently obtained in [14] for finite measures are here extended to the infinite measure case. In particular, it is showed that the inclusions between variable exponent Lebesgue spaces for infinite measures are never L-weakly compact. A lattice isometric representation of $${L^{p(\cdot )}(\Omega )}$$ as a variable exponent space $$L^{q(\cdot )}(0,1)$$ is given.
PubDate: 2022-07-16

• An Agmon–Allegretto–Piepenbrink principle for Schrödinger
operators

Abstract: Abstract We prove that each Borel function $$V : \Omega \rightarrow [{-\infty }, +\infty ]$$ defined on an open subset $$\Omega \subset {\mathbb R}^{N}$$ induces a decomposition $$\Omega = S \cup \bigcup _{i} D_{i}$$ such that every function in $$W^{1,2}_{0}(\Omega ) \cap L^{2}(\Omega ; V^{+} \,\mathrm {d}x)$$ is zero almost everywhere on S and existence of nonnegative supersolutions of $$-\Delta + V$$ on each component $$D_{i}$$ yields nonnegativity of the associated quadratic form $$\int _{D_{i}} ( \nabla \xi ^2+V\xi ^2).$$
PubDate: 2022-07-13

• Local well-posedness of a three-dimensional phase-field model for thrombus
and blood flow

Abstract: Abstract In this article we consider a fluid–structure interactions model on a three dimensional bounded domain, that describes the mechanical interaction between blood flow and a thrombus with Hookean elasticity. The interface between the two phases is given by a smooth transition layer, diffuse with a finite thickness. We derive various a priori estimates and prove local well-posedness results using the Faedo–Galerkin method.
PubDate: 2022-07-13

• A note on Banach spaces E for which $$E_{w}$$ E w is homeomorphic to
$$C_p(X)$$ C p ( X )

Abstract: Abstract $$C_p(X)$$ denotes the space of continuous real-valued functions on a Tychonoff space X endowed with the topology of pointwise convergence. A Banach space E equipped with the weak topology is denoted by $$E_{w}$$ . It is unknown whether $$C_p(K)$$ and $$C(L)_{w}$$ can be homeomorphic for infinite compact spaces K and L (Krupski, Rev R Acad Cienc Exact Fis Nat Ser A Mat (RACSAM) 110:557–563, 2016; Krupski and Marciszewski, J Math Anal Appl 452:646–658, 2017 ). In this paper we deal with a more general question: does there exist a Banach space E such that $$E_{w}$$ is homeomorphic to the space $$C_p(X)$$ for some infinite Tychonoff space X' We show that if such homeomorphism exists, then (a) X is a countable union of compact sets $$X_n, n \in \omega$$ , where at least one component $$X_n$$ is non-scattered; (b) the Banach space E necessarily contains an isomorphic copy of the Banach space $$\ell _{1}$$ .
PubDate: 2022-07-13

• The space of homogeneous preserving semistar operations on graded domains

Abstract: Abstract Let $$R=\bigoplus _{\alpha \in \Gamma }R_{\alpha }$$ be a graded integral domain. In this paper we study the space of homogeneous preserving semistar operations on R. We show if $$\star$$ is a homogeneous preserving semistar operation on R, then $$\star _a$$ is also homogeneous preserving. Let $${Kr_h}(R,b)$$ be the homogeneous Kronecker function ring of R with respect to the b-operation. It is shown that the set of valuation overrings of $${Kr_h}(R,b)$$ , endowed with the Zariski topology, is homeomorphism to $${\text {Zar}}_h(R)$$ , the set of gr-valuation overrings of R, endowed with the Zariski topology. We also show that the set $${\text {SStar}}_{f,hp}(R)$$ of finite type, homogeneous preserving semistar operations on R, endowed with the Zariski topology, is a spectral space.
PubDate: 2022-07-12

• Approximate Bayesian computation approach on the maximal offspring and
parameters in controlled branching processes

Abstract: Abstract Our purpose is to estimate the posterior distribution of the parameters of interest for controlled branching processes (CBPs) without prior knowledge of the maximum number of offspring that an individual can give birth to and without explicit likelihood calculations. We consider that only the population sizes at each generation and at least the number of progenitors of the last generation are observed, but the number of offspring produced by any individual at any generation is unknown. The proposed approach is twofold. Firstly, to estimate the maximum progeny per individual we make use of an approximate Bayesian computation (ABC) algorithm for model choice and based on sequential importance sampling with the raw data. Secondly, given such an estimate and taking advantage of the simulated values of the previous stage, we approximate the posterior distribution of the main parameters of a CBP by applying the rejection ABC algorithm with an appropriate summary statistic and a post-processing adjustment. The accuracy of the proposed method is illustrated by means of simulated examples developed with the statistical software R. Moreover, we apply the methodology to two real datasets describing populations with logistic growth. To this end, different population growth models based on CBPs are proposed for the first time.
PubDate: 2022-07-07

• The second Hankel determinant for subclasses of Bi-univalent functions
associated with a nephroid domain

Abstract: Abstract In the present paper, we obtain the estimates for the first two initial Taylor-Maclaurin coefficients and for the upper bounds of the Fekete-Szegö functional for new subclasses of the class $$\Sigma$$ of normalized analytic and bi-univalent functions, which are defined here with the aid of the Nephroid function. We also determine upper bounds of the functional $$\left a_{2}a_{4}-a_{3}^{2}\right$$ for the functions that belong to these classes. A related open problem as well some potential directions for further researches are posed in the concluding section.
PubDate: 2022-07-05

• Direct sum decompositions of projective and injective modules into
virtually uniserial modules

Abstract: Abstract A theorem due to Warfield states that “a ring R is left serial if and only if every (finitely generated) projective left R-module is serial” and a theorem due to Tuganbaev states that “a ring R is a finite direct product of uniserial Noetherian rings if and only if R is left duo, and all injective left R-modules are serial”. Most recently, in our previous paper [Virtually uniserial modules and rings, J Algebra 549:365–385, 2020], we introduced and studied the concept of virtually uniserial modules as a nontrivial generalization of uniserial modules. We say that an R-module M is virtually uniserial if, for every finitely generated submodule $$0\ne K\subseteq M$$ , $$K/\mathrm{Rad}(K)$$ is virtually simple (an R-module M is virtually simple if, $$M\ne 0$$ and $$M\cong N$$ for every nonzero submodule N of M). Also, an R-module M is called virtually serial if it is a direct sum of virtually uniserial modules. The above results of Warfield and Tuganbaev motivated us to study the following questions: “Which rings have the property that every projective module is virtually serial'” and “Which rings have the property that every injective module is virtually serial'”. The goal of this paper is to answer these questions.
PubDate: 2022-07-05

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