Volume 43, Issue 6
مرور بر اساس
ارسال های اخیر
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Non-homogeneous continuous and discrete gradient systems: the quasi-convex case
(Springer and the Iranian Mathematical Society (IMS), 2017-11-01)In this paper, first we study the weak and strong convergence of solutions to the following first order nonhomogeneous gradient system $$begin{cases}-x'(t)=nablaphi(x(t))+f(t), text{a.e. on} (0,infty)x(0)=x_0in ...
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Some results on pre-monotone operators
(Springer and the Iranian Mathematical Society (IMS), 2017-11-01)In this paper, some properties of pre-monotone operators are proved. It is shown that in a reflexive Banach space, a full domain multivalued $sigma$-monotone operator with sequentially norm$times$weak$^*$ closed ...
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Singular values of convex functions of matrices
(Springer and the Iranian Mathematical Society (IMS), 2017-11-01)Let $A_{i},B_{i},X_{i},i=1,dots,m,$ be $n$-by-$n$ matrices such that $sum_{i=1}^{m}leftvert A_{i}rightvert ^{2}$ and $sum_{i=1}^{m}leftvert B_{i}rightvert ^{2}$ are nonzero matrices and each $X_{i}$ is positive ...
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Locally finite basic classical simple Lie superalgebras
(Springer and the Iranian Mathematical Society (IMS), 2017-11-01)In this work, we study direct limits of finite dimensional basic classical simple Lie superalgebras and obtain the conjugacy classes of Cartan subalgebras under the group of automorphisms.
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A new hybrid conjugate gradient algorithm for unconstrained optimization
(Springer and the Iranian Mathematical Society (IMS), 2017-11-01)In this paper, a new hybrid conjugate gradient algorithm is proposed for solving unconstrained optimization problems. This new method can generate sufficient descent directions unrelated to any line search. Moreover, the ...
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Upper bounds for noetherian dimension of all injective modules with Krull dimension
(Springer and the Iranian Mathematical Society (IMS), 2017-11-01)In this paper we give an upper bound for Noetherian dimension of all injective modules with Krull dimension on arbitrary rings. In particular, we also give an upper bound for Noetherian dimension of all Artinian modules ...
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On normalizers of maximal subfields of division algebras
(Springer and the Iranian Mathematical Society (IMS), 2017-11-01)Here, we investigate a conjecture posed by Amiri and Ariannejad claiming that if every maximal subfield of a division ring $D$ has trivial normalizer, then $D$ is commutative. Using Amitsur classification of ...
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Composition of resolvents and quasi-nonexpansive multivalued mappings in Hadamared spaces
(Springer and the Iranian Mathematical Society (IMS), 2017-11-01)The proximal point algorithm, which is a well-known tool for finding minima of convex functions, is generalized from the classical Hilbert space framework into a nonlinear setting, namely, geodesic metric ...
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The lower bound for the number of 1-factors in generalized Petersen graphs
(Springer and the Iranian Mathematical Society (IMS), 2017-11-01)In this paper, we investigate the number of 1-factors of a generalized Petersen graph $P(N,k)$ and get a lower bound for the number of 1-factors of $P(N,k)$ as $k$ is odd, which shows that the number of 1-factors ...
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A hybrid mean value involving a new Gauss sums and Dedekind sums
(Springer and the Iranian Mathematical Society (IMS), 2017-11-01)In this paper, we introduce a new sum analogous to Gauss sum, then we use the properties of the classical Gauss sums and analytic method to study the hybrid mean value problem involving this new sums and Dedekind ...
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Subdirectly irreducible acts over some semigroups
(Springer and the Iranian Mathematical Society (IMS), 2017-11-01)In this paper, we characterize and find the number of subdirectly irreducible acts over some classes of semigroups, such as zero semigroups, right zero semigroups and strong chain of left zero semigroups.
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Semi-Rothberger and related spaces
(Springer and the Iranian Mathematical Society (IMS), 2017-11-01)In this paper our focus is to study certain covering properties in topological spaces by using semi-open covers. A part of this article deals with Rothberger-type covering properties. The notions of s-Rothberger, almost ...
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A descent method for explicit computations on curves
(Springer and the Iranian Mathematical Society (IMS), 2017-11-01)It is shown that the knowledge of a surjective morphism $Xto Y$ of complex curves can be effectively used to make explicit calculations. The method is demonstrated by the calculation of $j(ntau)$ (for some small ...
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Classifying pentavalnet symmetric graphs of order $24p$
(Springer and the Iranian Mathematical Society (IMS), 2017-11-01)A graph is said to be symmetric if its automorphism group is transitive on its arcs. A complete classification is given of pentavalent symmetric graphs of order 24p for each prime p. It is shown that a connected pentavalent ...
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A weak approximation for the Extrema's distributions of Levy processes
(Springer and the Iranian Mathematical Society (IMS), 2017-11-01)Suppose that $X_{t}$ is a one-dimensional and real-valued L'evy process started from $X_0=0$, which ({bf 1}) its nonnegative jumps measure $nu$ satisfying $int_{Bbb R}min{1,x^2}nu(dx)
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When is the ring of real measurable functions a hereditary ring?
(Springer and the Iranian Mathematical Society (IMS), 2017-11-01)Let $M(X, mathcal{A}, mu)$ be the ring of real-valued measurable functions on a measure space $(X, mathcal{A}, mu)$. In this paper, we characterize the maximal ideals in the rings of real measurable functions ...
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Existence of positive solutions for a second-order p-Laplacian impulsive boundary value problem on time scales
(Springer and the Iranian Mathematical Society (IMS), 2017-11-01)In this paper, we investigate the existence of positive solutions for a second-order multipoint p-Laplacian impulsive boundary value problem on time scales. Using a new fixed point theorem in a cone, sufficient conditions ...
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Initial coefficients of starlike functions with real coefficients
(Springer and the Iranian Mathematical Society (IMS), 2017-11-01)The sharp bounds for the third and fourth coefficients of Ma-Minda starlike functions having fixed second coefficient are determined. These results are proved by using certain constraint coefficient problem for functions ...
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Entropy of a semigroup of maps from a set-valued view
(Springer and the Iranian Mathematical Society (IMS), 2017-11-01)In this paper, we introduce a new entropy-like invariant, named Hausdorff metric entropy, for finitely generated semigroups acting on compact metric spaces from a set-valued view and study its properties. We establish the ...
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Defining relations of a group $Gamma= G^{3,4}(2,Z)$ and its action on real quadratic field
(Springer and the Iranian Mathematical Society (IMS), 2017-11-01)In this paper, we have shown that the coset diagrams for the action of a linear-fractional group $Gamma$ generated by the linear-fractional transformations $r:zrightarrow frac{z-1}{z}$ and $s:zrightarrow frac{-1}{2(z+1)}$ ...
