Global Analysis and Discrete Mathematics
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ارسال های اخیر

Solving Fredholm Integral Equations of the Second Kind Using an Improved Cuckoo Optimization Algorithm
(Damghan Universityدانشگاه دامغان, 20221101)In this paper, we propose an improved cuckoo optimization algorithm (ICOA) to determine unknown function u(x) in the Fredholm integral equations of the second kind. To show utility and capability of the ICOA, we solve some ...

Legendre Spectral Tau Method for Solving the Fractional IntegroDifferential Equations with A Weakly Singular Kernel
(Damghan Universityدانشگاه دامغان, 20221101)In this paper, the Tau method based on shifted Legendre polynomials has been introduced to approximate the numerical solutions of a class of fractional integrodifferential equations with a weakly singular kernel . By ...

Some Results on cCovers of A Pair of Groups
(Damghan Universityدانشگاه دامغان, 20221101)Let G be a group and N be a normal subgroup of G. In this paper, we provide some results on ccovers of a pair of groups. Moreover, we prove that every cperfect pair of groups (G, N) admits at least one ccover and also ...

A Note on the Descent Property Theorem for the Hybrid Conjugate Gradient Algorithm CCOMB Proposed by Andrei
(Damghan Universityدانشگاه دامغان, 20180101)In [1] (Hybrid Conjugate Gradient Algorithm for Unconstrained Optimization J. Optimization. Theory Appl. 141 (2009) 249  264), an efficient hybrid conjugate gradient algorithm, the CCOMB algorithm is proposed for solving ...

On Marginal Automorphisms of a Group Fixing the Certain Subgroup
(Damghan Universityدانشگاه دامغان, 20180101)Let W be a variety of groups defined by a set W of laws and G be a finite pgroup in W. The automorphism α of a group G is said to bea marginal automorphism (with respect to W), if for all x ∈ G, x−1α(x) ∈ W∗(G), where ...

A New Optimal Solution Concept for Fuzzy Optimal Control Problems
(Damghan Universityدانشگاه دامغان, 20180101)In this paper, we propose the new concept of optimal solution for fuzzy variational problems based on the possibility and necessity measures. Inspired by the well–known embedding theorem, we can transform the fuzzy variational ...

Some Results on Baer's Theorem
(Damghan Universityدانشگاه دامغان, 20180101)Baer has shown that, for a group G, finiteness of G=Zi(G) implies finiteness of ɣi+1(G). In this paper we will show that the converse is true provided that G=Zi(G) is finitely generated. In particular, when G is a finite ...

Security Analysis of a HashBased Secret Sharing Scheme
(Damghan Universityدانشگاه دامغان, 20161101)Secret sharing schemes perform an important role in protecting secret by sharing it among multiple participants. In 1979, (t; n) threshold secret sharing schemes were proposed by Shamir and Blakley independently. In a (t; ...

A Lax Operator Hierarchy for the New Fifth Order Integrable System
(Damghan Universityدانشگاه دامغان, 20161101)We consider the Lax representation of the new twocomponent coupled integrable system recently discovered by the author. Connection of the hierarchy of infinitely many Lax pairs with each other is presented.

A Method for Solving Optimal Control Problems Using Genetic Programming
(Damghan Universityدانشگاه دامغان, 20180101)This paper deals with a novel method for solving optimal control problems based on genetic programming. This approach produces some trial solutions and seeks the best of them. If the solution cannot be expressed in a closed ...

Hybrid Fuzzy Fractional Differential Equations by Hybrid Functions Method
(Damghan Universityدانشگاه دامغان, 20180101)In this paper, we study a new operational numerical method for hybrid fuzzy fractional differential equations by using of the hybrid functions under generalized Caputo type fuzzy fractional derivative. Solving two examples ...

A hybrid algorithm for the path center problem
(Damghan Universityدانشگاه دامغان, 20161101)Let a graph G = (V;E) be given. In the path center problem we want to find a path P in G such that the maximum weighted distance of P to every vertex in V is minimized. In this paper a genetic algorithm and ahybrid of ...

On the Exact Solution for Nonlinear Partial Differential Equations
(Damghan Universityدانشگاه دامغان, 20161101)In this study, we aim to construct a traveling wave solution for nonlinear partial differential equations. In this regards, a cosinefunction method is used to find and generate the exact solutions for three different types ...

Yet Another Application of the Theory of ODE in the Theory of Vector Fields
(Damghan Universityدانشگاه دامغان, 20161101)In this paper we are supposed to define the θ−vector field on the n−surface S and then investigate about the existence and uniqueness of its integral curves by the Theory of Ordinary Differential Equations. Then thesubject ...

The Study of Nonlinear Dynamical Systems Nuclear Fission Using Hurwitz Criterion
(Damghan Universityدانشگاه دامغان, 20161101)In this paper, the nonlinear dynamic system of equations, a type of nuclear ssion reactor is solved analytically and numerically. Considering that the direct solution of threedimensional dynamical systems analysis and ...

Numerical Treatment of Geodesic Differential Equations on Two Dimensional Surfaces
(Damghan Universityدانشگاه دامغان, 20161101)This paper presents a brief instructions to nd geodesics equations on two dimensional surfaces in R3. The resulting geodesic equations are solved numerically using Computer Program Matlab, the geodesics are displayed ...

VertexCut Sets and Tenacity of Organic Compounds CnH2n+2
(Damghan Universityدانشگاه دامغان, 20200601)Abstract Consider some vertices of a graph G are omitted, there are some ceriteria for measuring the vulnerability of the graph; Tenacity is one of them. In the de nition of tenacity we use vertex cut S and some items, ...

Regularity of Bounded TriLinear Maps and the Fourth Adjoint of a TriDerivation
(Damghan Universityدانشگاه دامغان, 20200601)In this Article, we give a simple criterion for the regularity of a trilinear mapping. We provide if f : X × Y × Z −→ W is a bounded trilinear mapping and h : W −→ S is a bounded linear mapping, then f is regular if and ...

A practical algorithm for [r, s, t]coloring of graph
(Damghan Universityدانشگاه دامغان, 20200601)Coloring graphs is one of important and frequently used topics in diverse sciences. In the majority of the articles, it is intended to find a proper bound for vertex coloring, edge coloring or total coloring in the graph. ...

A note on essentially left $phi$contractible Banach algebras
(Damghan Universityدانشگاه دامغان, 20200601)In this note, we show that cite[Corollary 3.2]{sad} is not always true. In fact, we characterize essential left $phi$contractibility of the group algebras in terms of compactness of its related locally compact group. Also, ...