مرور Volume 40, Issue 5 بر اساس تاریخ انتشار
در حال نمایش موارد 1 - 10 از 10
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Bulletin of the Iranian Mathematical Society
(Springer and the Iranian Mathematical Society (IMS), 2014-10-01)
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On $L_1$-weak ergodicity of nonhomogeneous continuous-time Markov processes
(Springer and the Iranian Mathematical Society (IMS), 2014-10-01)In the present paper we investigate the $L_1$-weak ergodicity of nonhomogeneous continuous-time Markov processes with general state spaces. We provide a necessary and sufficient condition for such processes to ...
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Baer's lower nilradical and classical prime submodules
(Springer and the Iranian Mathematical Society (IMS), 2014-10-01)Let $N$ be a submodule of a module $M$ and a minimal primary decomposition of $N$ is known. A formula to compute Baer's lower nilradical of $N$ is given. The relations between classical prime submodules and their ...
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Existence and multiplicity of nontrivial solutions for $p$-Laplacian system with nonlinearities of concave-convex type and sign-changing weight functions
(Springer and the Iranian Mathematical Society (IMS), 2014-10-01)This paper is concerned with the existence of multiple positive solutions for a quasilinear elliptic system involving concave-convex nonlinearities and sign-changing weight functions. With the help of the Nehari ...
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ILU and IUL factorizations obtained from forward and backward factored approximate inverse algorithms
(Springer and the Iranian Mathematical Society (IMS), 2014-10-01)In this paper, an efficient dropping criterion has been used to compute the IUL factorization obtained from Backward Factored APproximate INVerse (BFAPINV) and ILU factorization obtained from Forward Factored APproximate ...
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Theoretical results on the global GMRES method for solving generalized Sylvester matrix equations
(Springer and the Iranian Mathematical Society (IMS), 2014-10-01)The global generalized minimum residual (Gl-GMRES) method is examined for solving the generalized Sylvester matrix equation [sumlimits_{i = 1}^q {A_i } XB_i = C.] Some new theoretical results are elaborated ...
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Groups in which every subgroup has finite index in its Frattini closure
(Springer and the Iranian Mathematical Society (IMS), 2014-10-01)In 1970, Menegazzo [Gruppi nei quali ogni sottogruppo e intersezione di sottogruppi massimali, Atti Accad. Naz. Lincei Rend. Cl. Sci. Fis. Mat. Natur. 48 (1970), 559--562.] gave a complete description ...
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On the elliptic curves of the form $ y^2=x^3-3px $
(Springer and the Iranian Mathematical Society (IMS), 2014-10-01)By the Mordell-Weil theorem, the group of rational points on an elliptic curve over a number field is a finitely generated abelian group. There is no known algorithm for finding the rank of this group. This paper ...
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Non existence of totally contact umbilical slant lightlike submanifolds of indefinite Sasakian manifolds
(Springer and the Iranian Mathematical Society (IMS), 2014-10-01)We prove that there do not exist totally contact umbilical proper slant lightlike submanifolds of indefinite Sasakian manifolds other than totally contact geodesic proper slant lightlike submanifolds. We also prove ...
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On finite $X$-decomposable groups for $X={1, 2, 3, 4}$
(Springer and the Iranian Mathematical Society (IMS), 2014-10-01)Let $mathcal {N}_G$ denote the set of all proper normal subgroups of a group $G$ and $A$ be an element of $mathcal {N}_G$. We use the notation $ncc(A)$ to denote the number of distinct $G$-conjugacy classes ...
