Articles in Refereed Journals

 

 

 

 

On the properties of invariants of forms

Applied Sciences, Vol. 12, 2010, pp. 109-114.

Mehdi Nadjafikhah and Parastoo Kabi-Nejad

 

Invariant, homogeneous ploynomial, weight.

This paper is devoted to a discussion of speci¯c properties of

invariants in the theory of forms.

Url: http://www.mathem.pub.ro/apps/v12/A12-na.pdf

 

 

 

 

 

 

 

Classification of similarity solutions for inviscid Burgers' equation

Adv. appl. Clifford alg., DOI 10.1007/s00006-008-0145-0. 2009; [indexed in ISI]

Mehdi Nadjafikhah and Rouhollah Bakhshandeh-Chamazkoti

 

Lie-point symmetries - similarity solution - optimal system of Lie sub-algebras

Using the basic Lie symmetry method, we find the most general Lie point symmetries group of the inviscid Burgers’ equation. Looking at the adjoint representation of the obtained symmetry group on its Lie algebra, we find the preliminary classification of its group-invariant solutions. The latter provides new exact solutions for the inviscid Burgers’ equation.

Url: http://www.springerlink.com/content/714j2658254qr832/

 

 

 

 

 

 

 

 

 

 

 

A symmetry classification for a class of (2 + 1)-nonlinear wave equation 

Nonlinear analysis: Theory and applications. 2009;71(11):5164-5169 [indexed in ISI]

Mehdi Nadjafikhah, Rouhollah Bakhshandeh-Chamazkoti and Ali Mahdipour-Shirayeh

 

Infinitesimal generator; Lie symmetry; (2+1)-nonlinear wave equation; Prolongation

In this paper, a symmetry classification of a (2+1)-nonlinear wave equation utt−f(u)(uxx+uyy)=0 where f(u) is a smooth function on u, using Lie group method, is given. The basic infinitesimal method for calculating symmetry groups is presented, and used to determine the general symmetry group of this (2+1)-nonlinear wave equation.

Url: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V0Y-4W04KFD-5&_user=10&_coverDate=12%2F01%2F2009&_alid=1106524018&_rdoc=2&_fmt=high&_orig=search&_cdi=5659&_sort=r&_docanchor=&view=c&_ct=2&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=a4ddc64e885dbc8e0640e416fd40e4c5

 

 

 

 

 

 

 

 

 

Fuzzy differential invariants (FDI) 

Chaos, Solitons and Fractals. 2009;42:167-169 [indexed in ISI]

Mehdi Nadjafikhah and Rouhollah Bakhshandeh-Chamazkoti

 

Fuzzy manifold, fuzzy equation.

In this paper, we have tried to apply the concepts of fuzzy set to Lie groups and fuzzy differential invariant (FDI) in order to provide suitable conditions for applying Lie symmetry method in solving fuzzy differential equations (FDEs). For this, we define a -fuzzy submanifold and fuzzy immersion with some examples. In main section, we defined the fuzzy Lie group and some its relative concepts such as fuzzy transformation group and fuzzy G-invariant. The goal of this paper is to introduce and study new defining for fuzzy Lie group and fuzzy differential invariant (FDI). Also, some illustrative examples are given.

Url: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TJ4-4W2M6NV-H&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_searchStrId=1106538158&_rerunOrigin=google&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=7e194f2cfb0f0b7a0e77ffa40916bb9e

 

 

 

 

 

 

 

 

 

Fuzzy Lie Groups 

Mathematical Sciences. 2009;2(2):193-206

Mehdi Nadjafikhaha and Rohollah Bakhshandeh Chamazkotia

 

 

In this paper, we have tried to apply the concepts of fuzzy sets to the Lie groups and its relative concepts. By considering the definition of C1-fuzzy manifolds, we define C1−fuzzy submanifolds. In the main section, we defined the fuzzy Lie groups, fuzzy transformation groups and fuzzy G-invariants. finally our aim is to construct fuzzy differential invariants.

Url: http://www.kiau.ac.ir/~math.science/Content/Vol2No2/5.pdf

 

 

 

 

 

 

 

 

 

Galilean geometry of motions 

Applied Sciences. 2009;11:91-105

Mehdi Nadjafikhah and Ahmad-Reza Forough

 

Galilean motion, Cartan equivalence method, moving coframe.

In this paper we show that Galilean group is a matrix Lie group and find its structure. Then provide the invariants of special Galilean geometry of motions, by Olver's method of moving coframes, we also find its corresponding {e}-structure.

Url: http://www.mathem.pub.ro/apps/v11/A11-na.pdf

 

 

 

 

 

 

 

 

 

Generating SL(2)-differential invariants by Hilbert’s operatores 

Mathematical Sciences. 2009;3(1):17-24

Mehdi Nadjafikhah and Parastoo Kabi-Nejad

 

Invariant, Homogeneous polynomial, Hilbert’s operator.

In this paper, we will explain how to find differential invariants of unimodular Lie group SL(2) on the space of homogeneous polynomials of degree n by Hilbert’s  operators.

Url: http://www.kiau.ac.ir/~math.science/Content/Vol3No1/2.pdf

 

 

 

 

 

 

 

 

 

Lie symmetries and solutions of KdV equation 

International Mathematical Forum. 2009;4(4):165-176

Mehdi Nadjafikhah and Seyed-Reza Hejazi

 

KdV equation, symmetry, differential form, differential equation, prolongation.

Symmetries of a differential equations is one of the most important concepts in theory of differential equations and physics. One of the most prominent equations is KdV (Kortwege-de Vries) equation with application in shallow water theory. In this paper we are going to explain a particular method for finding symmetries of KdV equation, which is called Harrison method. Our tools in this method are Lie derivatives and differential forms, which will be discussed in the first section more precisely. In second chapter we will have some analysis on the solutions of KdV equation and we give a method, which is called first integral method for finding the solutions of KdV equation.

Url: http://www.m-hikari.com/imf-password2009/1-4-2009/nadjafikhahIMF1-4-2009.pdf

 

 

 

 

 

 

 

 

 

Lie Symmetries of Inviscid Burgers’ Equation 

Adv. appl. Clifford alg. 2009;19:101-112 [indexed in ISI]

Mehdi Nadjafikhah

 

Lie group analysis - Burgers equation - Symmetry group

The present paper solves completely the problem of the Lie group analysis of nonlinear equation u t (x, t) + g(u)u x (x, t) = 0, where g(u) is a smooth function of u. And apply these results on inviscid Burgers equation.

Url: http://www.springerlink.com/content/h96gv00263tqq062/

 

 

 

 

 

 

 

 

 

Symmetry analysis for a new form of the vortex mode equation 

Differential Geometry - Dynamical Systems. 2009;11

Mehdi Nadjafikhah and Ali Mahdipour-Shirayeh

 

symmetry analysis, fundamental invariants, multidimensional simple waves

Giving a new form of the vortex mode equation by a proper change of parameter, our aim is to analyze the point and contact symmetries of the new equation. Fundamental invariants and a form of general solutions of point transformations along with some specific examples are also derived.

Url: http://www.mathem.pub.ro/dgds/v11/D11-na.pdf

 

 

 

 

 

 

 

 

 

Symmetry analysis of the cylinder Laplace equation 

2009;14(2):53-64 [indexed in ISI]

Mehdi Nadjafikhah and Seyed-Reza Hejazi

 

Laplace equation, invariant solution, optimal system.

The symmetry analysis for Laplace equation on cylinder is considered. Symmetry algebra, the structure of the Lie algebra of the symmetries and some related topics such as invariant solutions, one-parameter subgroups, one dimensional optimal system and di®erential invariants are given.

Url: http://www.mathem.pub.ro/bjga/v14n2/B14-na.pdf

 

 

 

 

 

 

 

 

 

 

Symmetry group classification for general Burger's equation 

Communications in Nonlinear Science and Numerical Simulations, DOI:10.1016/j.cnsns.2009.09.031. 2009; [indexed in ISI]

Mehdi Nadjafikhah and Rouholah Bakhshandeh-Chamazkoti

 

Infinitesimal generator; General Burgers’ equation; Optimal system; Preliminarily group classification

The present paper solves the problem of the group classification of the general Burgers’ equation ut=f(x,u)ux2+g(x,u)uxx, where f and g are arbitrary smooth functions of the variable x and u, by using Lie method. The paper is one of the few applications of an algebraic approach to the problem of group classification that is called preliminary group classification. Looking the adjoint representation of  on its Lie algebra , we will deal with the construction of the optimal system of its one-dimensional subalgebras. The result of the work is a wide class of equations summarized in table form.

Url: http://198.81.200.2/science?_ob=ArticleURL&_udi=B6X3D-4XBR4ND-1&_user=10&_coverDate=09%2F30%2F2009&_rdoc=68&_fmt=high&_orig=browse&_srch=doc-info(%23toc%237296%239999%23999999999%2399999%23FLA%23display%23Articles)&_cdi=7296&_sort=d&_docanchor=&view=c&_ct=174&_acct=C000050221&_version=1&_urlVersion=

 

 

 

 

 

 

 

 

 

The special linear representations of compact Lie groups 

Mathematical Sciences. 2009;

Mehdi Nadjafikhah and Rohollah Bakhshandeh-Chamazkoti

 

Semi-simple, Special linear representation, Equivalent, Character.

The special linear representation of a compact Lie group G is a kind of linear representation of compact Lie group G with special properties. It is possible to define the integral of linear representation and we can extend this concept to special linear representation for next using.

Url: http://arxiv.org/abs/0711.2775

 

 

 

 

 

 

 

 

 

Affine classification of n−curves 

Balkan Journal of Geometry and Its Applications. 2008;13(2):66-73 [indexed in ISI]

Mehdi Nadjafikhah and Ali Mahdipour-Shirayeh

 

affine differential geometry, curves in Euclidean space, differential invariants.

The classification of curves up to affine transformations in a finite dimensional space was studied by some different methods. In this paper, we obtain the exact formulas of affine invariants via the equivalence problem in view of Cartan's theorem and then, we state a necessary and sufficient condition for the classification of n-Curves.

 

 

 

 

 

 

 

 

 

First integrals of a special system of ODEs 

International Journal of Engineering. 2008;7

Mehdi Nadjafikhah and Seyed-Reza Hejazi

 

Distribution, First Integral, RLC Circuit, Heat Capacity

In this paper we suggest a method to calculate the first integrals of a special system of the first order of differential equations. Then we use the method for finding the solutions of some differential equations such as, the differential equation of RLC circuit.

Url: http://www.ije.ir/abstract/{Volume:21-Transactions:B-Number:4}/=948

 

 

 

 

 

 

 

 

 

Self equivalence 3rd order odes by time-fixed transformations 

Applied Sciences. 2008;10:176-183

Mehdi Nadjafikhah and Ahmad-Reza Forough

 

Lie group, Jet bundle, Cartan equivalence problem, Gardner method of equivalence.

Let y''' = f(x,y,y',y'') be a 3-rd order ODE. By Cartan equivalence method, we will study the local equivalence problem under the transformations group of time-fixed coordinates.

Url: http://www.mathem.pub.ro/apps/v10/A10-NA.pdf

 

 

 

 

 

 

 

 

 

The generalized classical time-space 

Mathematical Sciences. 2008;2(4):327-324

Mehdi Nadjafikhah and Seyed-Mehdi Mousavi

 

sub-Riemannian geometry, space-time.

The newest model for space-time is based on sub-Riemannian geometry. In this paper, we use a combination of Lorentzian and sub-Riemannian geometry, the suggest a new model which seems like to its ancestors, but with the most efficient in application. In continuation, we try to show a new connection which calls generalized connection, and prove some its properties.

Url: http://kiau.ac.ir/~math.science/Content/Vol2No4/1.pdf

 

 

 

 

 

 

 

 

 

Differential invariants of SL(2) and SL(3)−group actions on R^2 

Mathematical Sciences. 2007;1(3):75-84

Mehdi Nadjafikhah and Seyed-Reza Hejazi

 

Differential invariant, infinitesimal generator, generic orbit, prolongation.

The main purpose of this paper is calculation of differential invariants which arise from prolonged actions of two Lie groups SL(2) and SL(3) on the nth jet space of R2. It is necessary to calculate nth prolonged infinitesimal generators of the action.

Url: http://kiau.ac.ir/~math.science/Content/Vol1No3/8.pdf

 

 

 

 

 

 

 

 

 

Time-fixed geometry of 2nd order ODEs 

IUST International Journal of Engineering Science. 2007;18(1):13-18

Mehdi Nadjafikhah and Ahmad-Reza Forough

 

Cartan equivalence problem, Moving coframe

Let y'' = f(x, y, y') be a 2nd order ODE. By Cartan equivalence method, we will study the local equivalence problem under the transformations group of time-fixed coordinates. We are going to solve this problem by an applicable method which has been recognized by R. Gardner [2], and classify them.

Url: http://www.iust.ac.ir/ijesen/article-A-10-1-179-1-en.html

 

 

 

 

 

 

 

 

 

Classification of cubics up to affine transformations 

Differential geometry & Dynamical Systems. 2006;8(1):184-195

Mehdi Nadjafikhah and Ahmad-Reza Forough

 

group-action, invariance, classification, prolongation.

Abstract. Classification of cubics (that is, third order planar curves in the R2) up to certain transformations is interested since Newton, and treated by several  authors. We classify cubics up to affine transformations, in seven class, and give a complete set of representatives of the these classes. This result is complete and briefer than the similar results.

Url: http://www.mathem.pub.ro/dgds/v8/d8.htm

 

 

 

 

 

 

 

 

 

The Lie algebra of smooth sections of a T−bundle 

IUST International Journal of Engineering Science. 2006;17:81-85

Mehdi Nadjafikhah and Hamid-Reza Salimi-Moghadam

 

Vector bundle, Lie theory.

In this article, we want to generalize the concept of the Lie algebra of vector fields. For this, in section 2, we define the concept of T−bundle which is a canonical generalization of the tangent bundle and define the category of such objects. In section 3, the T−bundle Lb i=1 TM, and is defined and showed that any T−bundle is isomorphic to a suitable Lb i=1 TM, for some b. Then, by defining the multiplication and bracket on the space of sections of T−bundle Lb i=1 TM, we put multiplication and bracket for smooth sections of an arbitrary T−bundle; and show that the set of all smooth sections of a T−bundle with these multiplication and bracket and also with point-wise addition and scaler product, forms a Lie algebra.

Url: http://www.iust.ac.ir/ijesen/article-A-10-1-138-1-en.html

 

 

 

 

 

 

 

T−bundle: A generalization of tangent bundle 

IUST International Journal of Engineering Science. 2005;16(4):39-45

Mehdi Nadjafikhah and Hamid-Reza Salimi-Moghadam

 

T−bundle, sections of a T−bundle, Lie theory.

The purpose of this paper is, to generalize the concept of tangent bundle and some definitions and theorems. In section 2, we review the concepts of T−bundle and Lie algebra of the sections of such objects (see [1]). In sections 3 and 4, we generalize the flow of a vector field and Lie algebra of a Lie group, to flow of a section of a T−bundle and generalized Lie algebra of a Lie group, respectively.

Url: http://www.iust.ac.ir/ijesen/article-A-10-1-138-1-en.html

 

 

 

 

 

 

 

 

 

On the classification of certain curves 

Differential geometry & Dynamical Systems. 2004;6:14-22

Mehdi Nadjafikhah

 

Lie transformation theory, equivalence of submanifolds, symmetry, differential invariants.

The purpose of this paper is to classify the curves in the form y3 = c3x3+c2x2+c1x + c0, with c3 6= 0, up to projective transformations, and then show that, in the regular case, the necessary and sufficient condition for the two curves y3 = c3x3 + c2x2 + c1x + c0 and y3 = ¯c3x3 + ¯c2x2 + ¯c1x + ¯c0 with c3¯c3 6= 0, are equivalece to a projective transformation is that ... Furthermore, several special cases are considered.

Url: http://www.mathem.pub.ro/dgds/v6/d6.htm

 

 

 

 

 

 

 

 

 

Affine differential invariants for planar curves 

Balkan Journal of geometry and its applications. 2002;7(1):69-78 [indexed in ISI]

Mehdi Nadjafikhah

 

differential invariant, differential operator, moving frame, moving coframe.

In this paper we solve the affine equivalence problem for the graph of functions with real values by finding a complete system of differential invariants for

the affine group action.

Url: http://www.emis.de/journals/BJGA/7.1/b71nadj.pdf

 

 

 

 

 

 

 

 

 

A representation of the prolongations of a G−structure 

Journal of Mathematics. 1997;(30):109-123

Ebrahim Esrafilian and Mehdi Nadjafikhah

 

G-structure, Matrix Lie group, Prolongation, Vector bundle

In this paper, we describe the general group of order two $GP^2_n$. We prove an arbitrary prolongation of a Lie subgroup of $GL(n,Re)$ is a direct sum of additive Lie group of the form $Re^{ ilde{n}}$ and a Lie sub-group of $GL(n,Re)$. then we show that an arbitrary prolongation of a Lie subalgebra of $Mat(n imes n)$ is a direct sum of an additive Lie subalgebra of the form $Re^{ ilde{n}}$ and a Lie subalgebra of $Mat(n imes n)$. In conclusion structure group of every k'th order Geometric structure on a given $n$ dimmentinal manifold is isomorphic to an additive standard group $Re^{ ilde{n}}$, with $0leq ilde{n} leq k imes frac{n^2 (3n-1)}{2}$, and a Lie subgroup of $GL(n,Re)$.

Url: http://mathnet.kaist.ac.kr/mathnet/thesis_content.php?no=273644

 

 

 

 

 

 

 

 

 

The tangent bundle of higher order 

Nonlinear Analysis. 1997;30(8):5003-5007 [indexed in ISI]

Ebrahim Esrafilian and Mehdi Nadjafikhah

 

Commutative algebra; Dual; Germ; Ideal; Jet; multi index and Vector bundle

There are varous definitions for tangent space


there are such as algebraic geometric and phisical ones which studied in Brocker and Janich's book The concept of the tangent bundle of higher order is due to N. Newns and In this paper we give tow new definitions of tangent bundle of higher order on a finite dimentional Hausdormanifold and we show that they are equivalent

Url: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V0Y-3W0FWV8-N6&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_searchStrId=1106515944&_rerunOrigin=google&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=74256334be7205d2b0a4f308f9fd3fbd

 

 

 

 

 

 

 

 

 

Do not search the Finite rings in far away 

Roshd, Magazine of Mathematical Education. 1992;(33):13-25

Mehdi Nadjafikhah

 

 

 

 

 

 

 

 

 

 

r/2-circles and r/2-spheers 

Roshd, Magazine of Mathematical Education. 1990;21:35-41

Mehdi Nadjafikhah

 

 

 

 

 

 

 

Articles in Conferences

 

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Application of Cartan's equivalence method in symmetries of differential equations  L

The 1st Regional Conference on Mathematics and its Applications in Engineering Sciences. 2010; Iran, Joybar.

Mehdi Nadjafikhah and Elahe Oftadeh

 

 

 

 

 

 

 

 

 

 

Application of Systems of Second Order Differential Equations in Characterization of Totally Geodesic Foliations  L

The 4th Applied Mathematics Conference. 2010; Iran, Zahedan

Mehdi Nadjafikhah and Fatemeh Ahangary

 

 

 

 

 

 

 

 

 

 

Structure of symmetry groups via Maurer-Cartan's forms  L

The 1st Regional Conference on Mathematics and its Applications in Engineering Sciences. 2010; Iran, Joybar.

Mehdi Nadjafikhah and M. Abdolsamadi

 

 

 

 

 

 

 

 

 

 

Symmetry method in solving differential equations in chemistry and biochemistry  L

The 1st Regional Conference on Mathematics and its Applications in Engineering Sciences. 2010; Iran, Joybar

Mehdi Nadjafikhah and P. Ahmadi

 

 

 

 

 

 

 

 

 

 

 

Point and contact symmetry for a non-linear differential equation

5th seminar on geometry and topology. 2009; University of Kurdistan, Sanandaj, Iran

Mehdi Nadjafikhah and Ali Mahdipour-Shirayeh

 

 

 

 

 

 

 

 

 

 

Equivalence of surfaces

1st national conference of Mathematics and its Applications. 2008;

Mehdi Nadjafikhah and Seyede-Azadeh Shirafkan

 

 

 

 

 

 

 

 

 

 

On Cartan's method of moving frames

39th Iranian Mathematical Conference. 2008;

Mehdi Nadjafikhah and Ali Mahdipour-Shirayeh

 

 

 

 

 

 

 

 

 

 

Solution of nonlinear ODEs by first integrals

8th Seminar on Differential Equations and Dynamical Systems. 2008; Isfahan

Mehdi Nadjafikhah and Seyed-Reza Hejazi

 

 

 

 

 

 

 

 

 

 

Generalized classical time-space

4st Seminar of Geometry and Topology. 2007;

Mehdi Nadjafikhah and Seyed-Mehdi Mousavi

 

 

 

 

 

 

 

 

 

 

Cartan construction for finite dimensional Lie pseudogroups

4st Seminar of Geometry and Topology. 2006;

Mehdi Nadjafikhah and Ali Mahdipour-Shirayeh

 

 

 

 

 

 

 

 

 

 

Cartan equivalence method for 3rd order odes up to time-fixed transformations

37st Iranian Mathematics Conference. 2006;

Mehdi Nadjavkhah and Ahmad-Reza Forough

 

 

 

 

 

 

 

 

 

 

Equivalence 2nd order odes by time-fixed transformations 

4st Seminar of Geometry and Topology. 2006;

Mehdi Nadjafikhah and Ahmad Reza Forough

 

 

 

 

 

 

 

 

 

 

Exterior differential systems with symmetry 

38st Iranian Mathematics Conference. 2006;

Mehdi Nadjafikhah and Reza Aghayan

 

 

 

 

 

 

 

 

 

 

Geometrical foundations of numerical algorithms and symmetry 

38st Iranian Mathematics Conference. 2006;

Mehdi Nadjafikhah and Sara Mehdipour

 

 

 

 

 

 

 

 

The exterior differential system

38st Iranian Mathematics Conference. 2006;

Mehdi Nadjafikhah and Reza Aghayan

 

 

 

 

 

 

 

 

 

 

Finsler vector bundles and metrizable connections

36st Iranian Mathematics Conference. 2005;

Mehdi Nadjafikhah and Ali Mahdipour-Shirayeh

 

 

 

 

 

 

 

 

 

 

Isometric group of Finsler spaces

38st Iranian Mathematics Conference. 2005;

Mehdi Nadjafikhah, Ali Mahdipour-Shirayeh, and Hamid-Reza Salimi-Moghadam

 

 

 

 

 

 

 

 

 

 

Classification of homogeneous forth order equations with real coefficients up to affine transformations  L

4th Seminar on Mathematical Analysis and its Applications. 2004;

Mehdi Nadjafikhah

 

 

 

 

 

 

 

 

 

 

A new solution for the ane equivalence problem

2nd Joint Seminar on Applied Mathematics. 2003; Iran, Tehran, IUST

Mehdi Nadjafikhah

 

 

 

 

 

 

 

 

 

 

Classification of curves y^3 = c_3x^3+c_2x^2+c_1x+c_0 up to projective transformations

34st Iranian Mathematics Conference. 2003;

Mehdi Nadjafikhah

 

 

 

 

 

 

 

 

 

 

Galilean space-times

3 st Seminar of Geometry and Topology. 2003; Tabriz University

Mehdi Nadjafikhah and Ahmad-Reza Forough

 

 

 

 

 

 

 

 

 

 

T-boundles

3st Seminar of Geometry and Topology. 2003; Tabriz University

Mehdi Nadjafikhah and Hamid-Reza Salimi-Moghadam

 

 

 

 

 

 

 

 

 

 

Decomposition of higher order geometric structures

First Seminar of Geometry and Topology. 2001; Iran, Tabriz

Mehdi Nadjafikhah

 

 

 

 

 

 

 

 

 

 

Computer aided Lie theory of differential equations

2nd International Conference of Applied Mathematics. 2000; Iran, Tehran, IUST

Mehdi Nadjafikhah

 

 

 

 

 

 

 

 

Correspondence between G-parameter Lie groups of local diffeomorphisms and g-regular k-vector Fields

31st Iranian Mathematics conference. 2000; Iran, Tehran University

Ebrahim Esrafilian and Mehdi Nadjafikhah

 

 

 

 

 

 

 

 

 

 

E^k-functor, a new geometric object which is a generalization of the ordinary tangent object

31st Iranian Mathematics Conference. 2000; Iran, Tehran University

Mehdi Nadjafikhah and Ebrahim Esrafilian

 

 

 

 

 

 

 

 

 

 

Geometry of differential equations

2nd Joint Seminar on Applied Mathematics. 2000; Iran, Zanjan

Mehdi Nadjafikhah

 

 

 

 

 

 

 

 

 

 

The tangent bundle of higher order

In Second World Congress of Nonlinear Analysts. 1998; Greece

Ebrahim Esrafilian and Mehdi Nadjafikhah