Journal of Linear and Topological Algebra
Year:2013 | Volume:2 | Issue:4|Papers Count:6

This paper continues the investigation of the first author begun in part one. The hereditary properties of n -homomorphism amenability for Banach algebras are investigated and the relations between n -homomorphism amenability of a Banach algebra and its ideals are found. Analogous to the character amenability, it is shown that the tensor product of two unital Banach algebras is n -homomorphism amenable if and only if each one is n -homomorphism amenable.

In this paper we develop a natural generalization of Schauder basis theory, we term operator-valued basis or simply ov -basis theory, using operator-algebraic methods. We prove several results for ov -basis concerning duality, orthogonality, biorthogonality and minimality. We prove that the operators of a dual ov -basis are continuous. We also define the concepts of Bessel, Hilbert ov -basis and obtain some characterizations of them. We study orthonormal and Riesz ov -bases for Hilbert spaces. Finally we consider the stability of ov -bases under small perturbations. We generalize a result of Paley-Wiener [4] to the situation of ov -basis.

In this paper, applying the concept of generalized A -valued norm on a right H* -module and also the notion of f-homomorphism of Finsler modules over C* -algebras we first improve the definition of the Finsler module over H* -algebra and then define f-morphism of Finsler modules over H* -algebras. Finally we present some results concerning these new ones.

In this paper, we present the numerical solution of ordinary differential equations (or SDEs), from each order especially second-order with time-varying and Gaussian random coefficients. We indicate a complete analysis for second-order equations in special case of scalar linear second-order equations (damped harmonic oscillators with additive or multi-plicative noises). Making stochastic differential equations system from this equation, it could be approximated or solved numerically by different numerical methods. In the case of linear stochastic differential equations system by Computing fundamental matrix of this system, it could be calculated based on the exact solution of this system. Finally, this stochastic equation is solved by numerically method like Euler-Maruyama and Milstein. Also its Asymptotic stability and statistical concepts like expectation and variance of solutions are discussed.

Generalized solution on Neumann problem of the fourth order ordinary differential equation in space W2a(0, b) has been discussed, we obtain the condition on B.V.P when the solution is in classical form. Formulation of Quintic Spline Function has been derived and the consistency relations are given. Numerical method, based on Quintic spline approximation has been developed. Spline solution of the given problem has been considered for a certain value of a: Error analysis of the spline method is given and it has been tested by an example.

In this paper, we determine the structure of the space of multipliers of the range of a composition operator Cj that induces by the conditional expectation between two Lp(å) spaces.