Browsing Matematik Bölümü by Issue Date
Now showing items 1-20 of 544
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The efficiency on 2-generators of semi-direct product of groups
(1999)Let G be a semi-direct product of K by A where K and A are both cyclic groups of order n(nεN) and p (p is a prime), respectively. Then we prove that G has an efficient presentation on the minimal number, that is 2, of ... -
Recurrent immersions
(Walter de Gruyter GmbH, 1999)In this paper we consider the relations between immersions of recurrent type with the immersions having certain planar properties. Namely, we investigate the weak recurrent immersions -
Variable sampling integral control of infinite-dimensional systems
(Ieee, 2000)In this paper we present sampled-data low-gain I-control algorithms for infinite-dimensional systems in which the sampling period is not constant. The system is assumed to be exponentially stable with invertible steady ... -
Dissolution kinetics of ulexite in aqueous EDTA solutions
(Metallurgical Soc-C I M, 2000)The dissolution kinetics of ulexite in aqueous disodium Ethylene Diamine Tetra Acidic Acid (EDTA) solutions has been investigated with respect to the effects of particle size, solution concentration, pH of solution, ... -
The efficiency of standard wreath product
(Oxford Univ Press, 2000)Let xi be the set of all finite groups that have efficient presentations. In this paper we give sufficient conditions for the standard wreath product of two xi-groups to be a E-group. -
Digital variable sampling integral control of infinite-dimensional systems
(2000)In this paper we present sampled-data low-gain I-control algorithms for infinite-dimensional systems in which the sampling period is not constant. The system is assumed to be exponentially stable with invertible steady ... -
Approximation by p-Faber polynomials in the weighted Smirnov class E-P (G,omega) and the Bieberbach polynomials
(Springer-Verlag, 2001)Let G subset of C be a finite domain with a regular Jordan boundary L. In this work, the approximation properties of a p-Faber polynomial series of functions in the weighted Smirnov class EP (G, W) are studied and the rate ... -
The p-cockcroft property of central extensions of groups
(Marcel Dekker Inc, 2001)A presentation for an arbitrary group extension is well known. A generalization of the work by Conway et al. (Group Tenser 1972, 25, 405-418) on central extensions has been given by Balk et al. (J. Group Theor.). As an ... -
An obstruction to finding algebraic models for smooth manifolds with prescribed algebraic submanifolds
(Cambridge Univ Press, 2001)Let N ⊆ M be a pair of closed smooth manifolds and L an algebraic model for the submanifold N. In this paper, we will give an obstruction to finding an algebraic model X of M so that the submanifold N corresponds in X ... -
Generalizations of Fibonacci and Lucas sequences
(2002)In this paper, we consider the Hecke groups H(√q), q ≥ 5 prime number, and we find an interesting number sequence which is denoted by dn. For q = 5, we get d2n = L2n+1 and d2n+1 = √5F2n+2 where L2n+1 is (2n + 1)th Lucas ... -
On a class of surfaces in the Euclidean space
(2002)In this study we consider surfaces in the Euclidean space E2+d satisfying the conditions Undefined control sequence \centerdot h = LhQ(g,h) and Undefined control sequence \centerdot h = LAHQ^(AH,h). -
On Some Class of Hypersurfaces in En+1 Satisfying Chen’s Equality
(2002)In this paper we study pseudosymmetry type hypersurfaces in the Euclidean space E n+1 satisfying B. Y. Chen’s equality -
On some class of hypersurfaces in double-struck E signn+1 satisfying Chen's equality
(2002)In this paper we study pseudosymmetry type hypersurfaces in the Euclidean space n+1 satisfying B. Y. Chen's equality. -
On the extended hecke groups H¯¯¯¯¯(λq)
(2003)Hecke groups H(λq) have been studied extensively for many aspects in the literature, [5], [8]. The Hecke group H(λ3), the modular group PSL(2,Z ) , has especially been of great interest in many fields of mathematics, for ... -
Uniform convergence of bieberbach polynomials in closed radon domains
(2003)Recently, the classical Mergelyan's estimation about the uniform convergence of the Bieberbach polynomials to the conformai mapping in a closed domain with a smooth boundary was improved by ourselves. In this study this ... -
A note on some subgroups of psl(2,c)
(World Scientific Publ Co Pte Ltd, 2003)In this paper, we introduce some discrete subgroups of PSL(2, C) and determine the number of cusps of 3-manifolds associated to those groups. -
Some subgroups of the extended Hecke groups H(-)over-bar(lambda(q))
(Elsevier Science Bv, 2003)The authors consider the extended Hecke groups (H) over bar(lambda(q)) generated by T(z) = -1/z, S(z) = -1/(z + lambda(q)) and R(z) = 1/(z) over bar with lambda(q) = 2 cos(pi/q) for q greater than or equal to 3 an integer. ... -
State-space solutions to standard H∞ control problem
(2003)Simple state-space formulas are derived for all controllers solving a standard H∞ problem. In this paper, we assume that the systems are finite dimension, continuous-time, linear and time-invariant. There are efficient ... -
The p-cockcroft property of the semi-direct products of monoids
(World Scientific Publ Co Pte Ltd, 2003)The semi-direct product of arbitrary two monoids and a presentation for this product have received considerable attention, see for instance [12, 14, 15]. In [15], Wang defined a trivializer set of the Squier complex ... -
Integral control by variable sampling based on steady-state data
(Pergamon-Elsevier Science Ltd, 2003)In this paper we consider integral control algorithms with convergent adaptive sampling for multivariable infinite-dimensional systems. Steady-state gain information is used in choosing suitable integrator gains and we ...
