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 401 - 538 of 538 Journals sorted alphabetically Journal of mathematical and computational science       (Followers: 2) Journal of Mathematical and Fundamental Sciences Journal of Mathematical Behavior       (Followers: 6) Journal of Mathematical Chemistry       (Followers: 5) Journal of Mathematical Finance       (Followers: 6) Journal of Mathematical Imaging and Vision       (Followers: 6) Journal of Mathematical Logic       (Followers: 2) Journal of Mathematical Sciences Journal of Mathematical Sciences and Applications       (Followers: 2) Journal of Mathematical Sociology       (Followers: 3) Journal of Mathematics Journal of Mathematics and Statistics       (Followers: 6) Journal of Mathematics and Statistics Studies Journal of Mathematics and the Arts       (Followers: 1) Journal of Mathematics Education at Teachers College       (Followers: 5) Journal of Mathematics in Industry Journal of Mathematics Research Journal of Metallurgy       (Followers: 9) Journal of Modern 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Similar Journals
 Rendiconti del Circolo Matematico di PalermoJournal Prestige (SJR): 0.285 Number of Followers: 0      Hybrid journal (It can contain Open Access articles) ISSN (Print) 1973-4409 - ISSN (Online) 0009-725X Published by Springer-Verlag  [2469 journals]
• Rationality of Fano threefolds with terminal Gorenstein singularities, II

Abstract: Abstract We classify nonrational Fano threefolds X with terminal Gorenstein singularities such that $$\mathrm {{\text {rk}}}\, \mathrm {{\text {Pic}}}(X)=1$$ , $$(-K_X)^3\ge 8$$ , and $$\mathrm {{\text {rk}}}\, \mathrm {{\text {Cl}}}(X)\le 2$$ .
PubDate: 2022-06-24

• Global stability results for Volterra–Hadamard random partial
fractional integral equations

Abstract: Abstract This paper investigates the existence and stability of random solutions of a class of Hadamard fractional order functional partial integral equations with random effects in Banach spaces.
PubDate: 2022-06-23

• Proving the solution of Malfatti’s marble problem

Abstract: Abstract Malfatti’s problem is more than 200 years old and its solution given by the greedy arrangement has been stated first in 1994. The solution was obtained at that time by considering 14 arrangements and by justifying the exclusion of the non-greedy ones through a complex reasoning relying purely on numerical simulations in several crucial steps. By significantly improving the underlying methods and by filling still extant gaps, a full purely analytical proof of the solution is provided for the first time in the present work, especially based on a mixture of synthetic and analytic Euclidean geometry and on the theory of convex functions.
PubDate: 2022-06-20

• On generalized semi B-Fredholm operators

Abstract: Abstract In this paper we study two new classes of bounded linear operators acting on a Banach space X called lower semi B-Fredholm generalized operators and lower semi Saphar operators, respectively. We characterize a generalized semi B-Fredholm operator as the direct sum of a nilpotent operator and a semi Shapar operator and also we prove the stability of this class of operators under perturbations by operators with finite-range power.
PubDate: 2022-06-16

• Crossing limit cycles for discontinuous piecewise linear differential
centers separated by three parallel straight lines

Abstract: Abstract In this paper we study the continuous and discontinuous planar piecewise differential systems formed by four linear centers separated by three parallel straight lines denoted by $$\Sigma =\{(x,y)\in {\mathbb {R}}^2: x=-p, x=0, x=q,\ p,q>0\}.$$ We prove that when these piecewise differential systems are continuous they have no limit cycles. While for the discontinuous case we show that they can have at most four limit cycles and we also provide examples of such systems with zero, one, and two limit cycles. In particular we have solved the extension of the 16th Hilbert problem to this class of piecewise differential systems.
PubDate: 2022-06-16

• Some commutativity criteria for prime rings with central values involving
two endomorphisms

Abstract: Abstract The main purpose of this paper is to study the commutativity of a prime ring R with involution of the second kind provided with two endomorphisms satisfying certain algebraic identities. Finally, we provide examples to show that various restrictions imposed in the hypotheses of our theorems are not superfluous.
PubDate: 2022-06-09

• Existence and uniqueness result for nonlinear anisotropic elliptic
unilateral problems with variable exponent and measure data

Abstract: Abstract This paper treats the existence and uniqueness of entropy solutions for the unilateral problem associated with the Dirichlet problem of the following nonlinear elliptic equation $$\displaystyle {Au -div \phi ( u)=\mu ,}$$ where A is a Leray-Lions operator defined on the anisotropic Sobolev space with variable exponent into its dual, the lower order term $$\phi$$ is a continuous real function that does not check any growth condition and the second member $$\mu$$ is a measure function belongs to $$L^{1}(\Omega )+ W^{-1, \mathbf {p'}(\cdot )}(\Omega )$$ with $$W^{-1, \mathbf {p'}(\cdot )}(\Omega )$$ is the dual space.
PubDate: 2022-06-06

• An approximation model for projectile motion under air resistance
proportional to a power of the speed

Abstract: Abstract An application of Newton’s law to the motion of a projectile that is subject to the forces of both gravity and air resistance proportional to some power of the speed gives rise to an initial value problem for which explicit formulas for the exact solutions do not seem to be available. In this article, we solve instead a related problem and then compare the resulting small-angle approximations to the exact solutions and also to the parabolic Galilean flight paths that are traced in the absence of a retarding force. We establish that the trajectories of the exact solutions are always dominated by those of the small-angle approximations which, in turn, are always majorized by the Galilean flight trajectories.
PubDate: 2022-06-06

• Kirchhoff-type problems involving the fractional p-Laplacian on the
Heisenberg group

Abstract: Abstract In this paper, we are interested in the existence of solutions for a class of Kirchhoff-type problems driven by a non-local integro-differential operator with the homogeneous Dirichlet boundary conditions on the Heisenberg group as follows: \begin{aligned} \left\{ \begin{array}{ll} M(\iint _{{\mathbb {H}}^{2N}} u(\xi )-u(\eta ) ^{p}K(\eta ^{-1}\circ \xi )d\xi \,d\eta )\pounds ^{p}_{K}u=f(\xi ,u) &{} { \text{ in } } \Omega ,\\ u=0 &{} { \text{ in } } {\mathbb {H}}^N \setminus \Omega , \end{array} \right. \end{aligned} where $$\pounds ^{p}_{K}$$ is a non-local integro-differential operator with singular kernel $$K,\Omega$$ is an open bounded subset of the Heisenberg group $${\mathbb {H}}^N$$ with Lipshcitz boundary $$\partial \Omega$$ . Under some suitable assumptions on the functions M and f, together with the variational methods and the mountain pass theorem, we discuss the existence of weak solutions for the above problem on the Heisenberg group.
PubDate: 2022-06-04

• Minimal bandwidth for $${\mathbb C}^*$$ C ∗ -actions on generalized
Grassmannians

Abstract: Abstract The bandwidth of a $${\mathbb C}^*$$ -action of a polarized pair (X, L) is a natural measure of its complexity. In this paper, we study $${\mathbb C}^*$$ -actions on rational homogeneous spaces, determining which provide minimal bandwidth. We prove that the minimal bandwidth is linked to the smallest coefficient of the fundamental weight, in a base of simple roots, which describes the variety as a marked Dynkin diagram. As a direct application of the results we study the Chow groups of the Cayley plane $$\mathrm{E}_6(6)$$ .
PubDate: 2022-06-04

• Weak solutions for some fractional singular (p, q)-Laplacian nonlocal
problems with Hardy potential

Abstract: Abstract Here, a suitable method is presented to treat the elliptic partial derivative equations, especially the fractional singular (p, q)-Laplacian elliptic problems. These kinds of equations are used in the study of fluid flow, diffusive transport akin to diffusion, rheology, probability, electrical networks and etc. The existence of nontrivial solutions for some singular boundary value problems involving the fractional (p, q)-Laplacian operator in a smooth enough bounded domain in $${\mathbb {R}}^N$$ is proved. The method is based on the theory of the fractional Sobolev space via the variational method and critical point theory.
PubDate: 2022-06-03

• On critical double phase Kirchhoff problems with singular nonlinearity

Abstract: Abstract The paper deals with the following double phase problem \begin{aligned} \begin{aligned}&-m \left[ \int _\Omega \left( \frac{ \nabla u ^p}{p} + a(x) \frac{ \nabla u ^q}{q}\right) \,\mathrm {d}x\right] {\text{div}} \left( \nabla u ^{p-2}\nabla u + a(x) \nabla u ^{q-2}\nabla u \right) \\&\quad = \lambda u^{-\gamma } +u^{p^*-1}&\quad \text {in } \Omega ,\\&u > 0&\quad \text {in } \Omega ,\\&u = 0&\quad \text {on } \partial \Omega , \end{aligned} \end{aligned} where $$\Omega \subset {\mathbb {R}}^N$$ is a bounded domain with Lipschitz boundary $$\partial \Omega$$ , $$N\ge 2$$ , m represents a Kirchhoff coefficient, $$1<p<q<p^*$$ with $$p^*=Np/(N-p)$$ being the critical Sobolev exponent to p, a bounded weight $$a(\cdot )\ge 0$$ , $$\lambda >0$$ and $$\gamma \in (0,1)$$ . By the Nehari manifold approach, we establish the existence of at least one weak solution.
PubDate: 2022-06-01

• On mixed local-nonlocal operators with $$(\alpha , \beta )$$ ( α ,
β ) -Neumann conditions

Abstract: Abstract We consider some problems governed by the sum of a Laplacian and of a fractional Laplacian in presence of so–called $$(\alpha , \beta )$$ -Neumann conditions in an essentially linear context. Indeed, first we show an existence result for asymptotically linear elliptic problems, and then we establish some qualitative properties for solutions of the associated homogeneous parabolic problem, extending to this setting related results in the local case.
PubDate: 2022-05-27

• The critical fractional Ambrosetti–Prodi problem

Abstract: Abstract In this paper we focus on the following nonlocal problem with critical growth: \begin{aligned} \left\{ \begin{array}{ll} (-\Delta )^{s} u = \lambda u + u_{+}^{2^{*}_{s}-1} + f(x) &{} \text{ in } \Omega ,\\ u=0 &{} \text{ in } \mathbb {R}^{N}\setminus \Omega , \end{array} \right. \end{aligned} where $$s\in (0, 1)$$ , $$N>2s$$ , $$\Omega \subset \mathbb {R}^{N}$$ is a smooth bounded domain, $$\lambda >0$$ , $$(-\Delta )^{s}$$ is the fractional Laplacian, $$f= te_{1}+h$$ where $$t\in \mathbb {R}$$ , $$e_{1}$$ is the first eigenfunction of $$(-\Delta )^{s}$$ with homogeneous Dirichlet boundary datum, and $$h\in L^{\infty }(\Omega )$$ is such that $$\int _{\Omega } h e_{1}\, dx=0$$ . According to the interaction of the nonlinear term with the spectrum of $$(-\Delta )^{s}$$ , we establish some existence and multiplicity results for the above problem by means of variational methods.
PubDate: 2022-05-25

• Some applications of simultaneous continuous functional calculus

Abstract: Abstract We define and study a continuous functional calculus for a commutative family of normal elements of a $$C^{*}$$ -algebra. We obtain that this functional calculus is unique, continuous and satisfies the spectral mapping theorem. We also provide two applications. The first one concerns the existence of a particular orthonormal basis on a locally Hilbert space. The second for multi-dimensional continuous versions of N. Wiener and P. Lé vy theorems.
PubDate: 2022-05-24

• Prelog Chow rings and degenerations

Abstract: Abstract For a simple normal crossing variety X, we introduce the concepts of prelog Chow ring, saturated prelog Chow group, as well as their counterparts for numerical equivalence. Thinking of X as the central fibre in a (strictly) semistable degeneration, these objects can intuitively be thought of as consisting of cycle classes on X for which some initial obstruction to arise as specializations of cycle classes on the generic fibre is absent. Cycle classes in the generic fibre specialize to their prelog counterparts in the central fibre, thus extending to Chow rings the method of studying smooth varieties via strictly semistable degenerations. After proving basic properties for prelog Chow rings and groups, we explain how they can be used in an envisaged further development of the degeneration method by Voisin et al. to prove stable irrationality of very general fibres of certain families of varieties; this extension would allow for much more singular degenerations, such as toric degenerations as occur in the Gross–Siebert programme, to be usable. We illustrate that by looking at the example of degenerations of elliptic curves, which, although simple, shows that our notion of prelog decomposition of the diagonal can also be used as an obstruction in cases where all components in a degeneration and their mutual intersections are rational. We also compute the saturated prelog Chow group of degenerations of cubic surfaces.
PubDate: 2022-05-23

• An inertial-viscosity algorithm for solving split generalized equilibrium
problem and a system of demimetric mappings in Hilbert spaces

Abstract: Abstract In this paper, we introduce a new inertial-viscosity approximation method for solving a split generalized equilibrium problem and common fixed point problem in real Hilbert spaces. The algorithm is designed such that its convergence does not require the norm of the bounded linear operator underlying the split equilibrium problem. Moreover, a strong convergence result is proved under mild conditions in real Hilbert spaces. Furthermore, we give some numerical examples to show the efficiency and accuracy of the proposed method and we also compare the performance of our algorithm with other related methods in the literature.
PubDate: 2022-05-23

• Weakly-morphic modules

Abstract: Abstract Let R be a commutative ring, M an R-module and $$\varphi _a$$ be the endomorphism of M given by right multiplication by $$a\in R$$ . We say that M is weakly-morphic if $$M/\varphi _a(M)\cong \ker (\varphi _a)$$ as R-modules for every a. We study these modules and use them to characterise the rings $$R/\text {Ann}_R(M)$$ , where $$\text {Ann}_R(M)$$ is the right annihilator of M. A kernel-direct or image-direct module M is weakly-morphic if and only if each element of $$R/\text {Ann}_R(M)$$ is regular as an endomorphism element of M. If M is a weakly-morphic module over an integral domain R, then M is torsion-free if and only if it is divisible if and only if $$R/\text {Ann}_R(M)$$ is a field. A finitely generated $$\mathbb {Z}$$ -module is weakly-morphic if and only if it is finite; and it is morphic if and only if it is weakly-morphic and each of its primary components is of the form $$(\mathbb {Z}_{p^k})^n$$ for some non-negative integers n and k.
PubDate: 2022-05-21

• Commutativity of rings with constraints on endomorphisms

Abstract: Abstract Our purpose in this paper is to connect the commutativity of a quotient ring R/P with endomorphisms of R satisfying certain algebraic identities involving prime ideals. The obtained results cover many known theorems (cf. Bell and Daif in Canad Math Bull 37(4):443–447, 1994; Deng and Ashraf in Results Math 30(3–4):259–263, 1996; Oukhtite et al. in Int Electron J Algebra 28:127–140, 2020).
PubDate: 2022-05-17

• Strong convergence of an inertial Halpern type algorithm in Banach spaces

Abstract: Abstract In this article, we obtain the strong convergence of the new modified Halpern iteration process \begin{aligned} x_{n+1} = \alpha _{n}u + (1-\alpha _{n})T_{n}P(x_{n} + \theta _{n}(x_{n} - x_{n-1})), \ \ \ \ \ \ n=1,2,3,\ldots , \end{aligned} to a common fixed point of $$\{ T_{n}\}$$ , where $$\{ T_{n}\}_{n=1}^{\infty }$$ is a family of nonexpansive mappings on the closed and convex subset C of a Banach space X, $$P: X \longrightarrow C$$ is a nonexpansive retraction, $$\{\alpha _n\} \subset [0, 1]$$ and $$\{\theta _n\}\subset R^+$$ . Some applications of this result are also presented.
PubDate: 2022-05-12

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