Matematik-Makale Koleksiyonu: Recent submissions
Now showing items 241-260 of 503
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Approximation in weighted Smirnov classes
(Taylor & Francis Inc, 2015)In this work, the direct and inverse problems of approximation theory in the weighted Smirnov classes of analytic functions defined on the domains with a regular boundary are investigated. In particular, the constructive ... -
Fractional optimal control of a 2-dimensional distributed system using eigenfunctions
(Springer, 2009)This paper presents an eigenfunctions expansion based scheme for Fractional Optimal Control (FOC) of a 2-dimensional distributed system. The fractional derivative is defined in the Riemann-Liouville sense. The performance ... -
Hypersurfaces satisfying some curvature conditions in the semi-Euclidean space
(Pergamon-Elsevier Science Ltd, 2009)We consider some conditions on conharmonic curvature tensor K. which has many applications in physics and mathematics, on a hypersurface in the semi-Euclidean space E(s)(n+1). We prove that every conharmonicaly Ricci-symmetric ... -
Some new monoid and group constructions under semidirect products
(Charles Babbage Res Ctr, 2009)In this paper we mainly define semidirect product version of the Schutzenberger product and also a new two-sided semidirect product construction for arbitrary two monoids. Then, as main results, we present a generating and ... -
On the n-transitivity of the group of Möbius transformations on C∞
(Pergamon-Elsevier Science Ltd, 2009)Mobius transformations generate the conformal group in the plane and have been used in neural networks and conformal field theory. Sonic invariant characteristic properties of Mobius transformations such as the invariance ... -
Pinching theorems for totally real minimal submanifolds in cpn
(Cambridge Univ Press, 2009)Let M be an n-dimensional totally real minimal submanifold in CPn. We prove that if M is semi-parallel and the scalar curvature tau, -(n-1)(n-2)(n+1)/2 <= tau <= 0, then M is an open part of the Clifford torus T-n subset ... -
On some classes of super quasi-Einstein manifolds
(Pergamon-Elsevier Science Ltd, 2009)Quasi-Einstein and generalized quasi-Einstein manifolds are the generalizations of Einstein manifolds. In this study, we consider a super quasi-Einstein manifold, which is another generalization of an Einstein manifold. ... -
New examples of generalized sasakian-space-forms
(Rendiconti del Seminario Matematico, 2015)In this paper we study when a non-anti-invariant slant submanifold of a generalized Sasakian-space-form inherits such a structure, on the assumption that it is totally geodesic, totally umbilical, totally contact geodesic ... -
Grobner-shirshov bases and embedding of a semigroup in a group
(Jangjeon Mathematical Society, 2015)The main goal of this paper is to show that if a group G has a Grobner-Shirshov basis R that satisfies the condition R+, then the semigroup P (with positive rules in R as a defining relation) embeds in this group G. As a ... -
Refined estimates of trigonometric approximation for functions with generalized derivatives in weighted variable exponent Lebesgue spaces
(Walter De Gruyter Gmbh, 2012)The refined direct and inverse estimates for (alpha, psi)-derivatives of functions in weighted variable exponent Lebesgue spaces are proved. -
Some results on o*-groups
(Union Matematica Argentina, 2012)A compact Klein surface with boundary of algebraic genus g >= 2 has at most 12(g - 1) automorphisms. When a surface attains this bound, it has maximal symmetry, and the group of automorphisms is then called an M*-group. ... -
On quasi-einstein warped products
(Univ Al İ Cuza, 2012)We study quasi-Einstein warped product manifolds for arbitrary dimension n >= 3. -
Chen inequalities for submanifolds of a cosymplectic space form with a semi-symmetric metric connection
(Univ Al İ Cuza, 2012)In this paper, we prove Chen inequalities for submanifolds of a cosymplectic space form of constant phi-sectional curvature N2m+1(c) endowed with a semi-symmetric metric connection, i.e., relations between the mean curvature ... -
Contact cr-warped product submanifolds in generalized sasakian space forms
(Scientific Technical Research Council Turkey-Tubitak, 2012)We consider a contact CR-warped product submanifold M = M-inverted perpendicular x (f) M-perpendicular to of a trans-Sasakian generalized Sasakian space form (M) over tilde (f(1); f(2), f(3)). We show that M is a contact ... -
Some inequalities of trigonometric approximation in weighted orlicz spaces
(Walter de Gruyter GMBH, 2016)In the present work, we proved a refined direct theorem and an exact inverse theorem of trigonometric approximation in Orlicz spaces with weights satisfying some Muckenhoupt's A(p) condition. As a consequence, refined ... -
Approximation by polynomials in rearrangement invariant quasi banach function spaces
(Duke Univ Press, 2012)In the present work we deal with the approximation properties of certain linear polynomial operators in rearrangement invariant quasi Banach function spaces. We obtain some Jackson type direct theorem and sharp converse ... -
Approximation in weighted l-p spaces
(Union Matematica Argentina, 2012)The Lipschitz classes Lip (alpha, p, w), 0 < alpha <= 1 are defined for the weighted Lebesgue spaces L-w(p) with Muckenhoupt weights, and the degree of approximation by matrix transforms of f is an element of Lip (alpha, ... -
On some types of slant curves in contact pseudo-hermitian 3-manifolds
(Polish Acad Sciences İnst Mathematics, 2012)We study slant curves in contact Riemannian 3-manifolds with pseudo-Hermitian proper mean curvature vector field and pseudo-Hermitian harmonic mean curvature vector field for the Tanaka-Webster connection in the tangent ... -
Spherical product surfaces in e-4
(Ovidius Univ Press, 2012)In the present study we calculate the coefficients of the second fundamental form and curvature ellipse of spherical product surfaces in E-4. Otsuki rotational surfaces and Ganchev-Milousheva rotational surfaces are the ... -
On approximation in Weighted Orlicz spaces
(Walter De Gruyter Gmbh, 2012)An inverse theorem of the trigonometric approximation theory in Weighted Orlicz spaces is proved and the constructive characterization of the generalized Lipschitz classes defined in these spaces is obtained.
