FEF, Matematik Bölümü, Makale Koleksiyonu
Recent Submissions

On abelian group actions with TNIcentralizers
(Taylor & Francis, 2019)A subgroup H of a group G is said to be a TNIsubgroup if for any Let A be an abelian group acting coprimely on the finite group G by automorphisms in such a way that for all is a solvable TNIsubgroup of G. We prove that ... 
Frobenius groups of automorphisms with almost fixed point free kernel
(Elsevier, 2019)Let FH be a Frobenius group with kernel F and complement H, acting coprimely on the finite solvable group G by automorphisms. We prove that if CG(H) is of Fitting length n then the index of the nth Fitting subgroup Fn(G) ... 
Classification of finite groups according to their conjugacy class lengths
(Walter de Gruyter, 2019)In this paper, we classify all finite groups satisfying the following property: their conjugacy class lengths are setwise relatively prime for any six distinct classes. 
On a class of nonselfadjoint multidimensional periodic Schrodinger operators
(TÜBİTAK, 2019)We investigate the Schrodinger operator L(q) in L2 (Rd) (d >= 1) with the complexvalued potential q that is periodic with respect to a lattice Q. Besides, it is assumed that the Fourier coefficients q(gamma) of q with ... 
On the spectrality and spectral expansion of the nonselfadjoint mathieuhill operator in L2(−∞,∞)
(American Institute of Mathematical Sciences, 2020)In this paper we investigate the nonselfadjoint operator H generated in L2(infinity, infinity) by the MathieuHill equation with a complexvalued potential. We find a necessary and sufficient conditions on the potential ... 
Groups of automorphisms with TNIcentralizers
(Elsevier, 201803)A subgroup H of a finite group G is called a TNIsubgroup if NG(H)∩Hg=1 for any g∈G\NG(H). Let A be a group acting on G by automorphisms where CG(A) is a TNIsubgroup of G. We prove that G is solvable if and only if CG(A) ... 
Finite groups whose character degree graphs coincide with their prime graphs
(Springer, 201809)In the literature, there are several graphs related to a finite group G. Two of them are the character degree graph, denoted by ΔG), and the prime graph ΓG), In this paper we classify all finite groups whose character ... 
The spectrum of the Hamiltonian with a PTsymmetric Periodic Optical Potential
(World Scientific, 2017)We give a complete description, provided with a mathematical proof, of the shape of the spectrum of the Hill operator with potential 4 cos2 x+4iV sin 2x, where V ∈ (0, ∞). We prove that the second critical point V2, after ... 
Finite groups admitting a dihedral group of automorphisms
(Lugansk National Taras Shevchenko University, 2017)Let D = alpha, beta be a dihedral group generated by the involutions alpha and beta and let F = alpha beta). Suppose that D acts on a finite group G by automorphisms in such a way that CG(F)= 1. In the present paper we ... 
On the spectral properties of the Schrodinger operator with a periodic PTsymmetric potential
(World Scientific, 201705)In this paper, we investigate the spectrum and spectrality of the onedimensional Schrodinger operator with a periodic PTsymmetric complexvalued potential. 
Essential spectral singularities and the spectral expansion for the hill operator
(American Institute of Mathematical Sciences, 201711)In this paper we investigate the spectral expansion for the onedimensional Schrodinger operator with a periodic complexvalued potential. For this we consider in detail the spectral singularities and introduce new concepts ... 
On the influence of fixed point free nilpotent automorphism groups
(Springer, 201712)A finite group FH is said to be Frobeniuslike if it has a nontrivial nilpotent normal subgroup F with a nontrivial complement H such that for all nonidentity elements . Let FH be a Frobeniuslike group with complement H ... 
On sharp asymptotic formulas for the SturmLiouville operator with a matrix potential
(Springer, 201607)In this article we obtain the sharp asymptotic formulas for the eigenvalues and eigenfunctions of the nonselfadjoint operators generated by a system of the SturmLiouville equations with Dirichlet and Neumann boundary ... 
Action of a frobeniuslike group with kernel having central derived subgroup
(World Scientific Publishing, 201609)A finite group FH is said to be Frobeniuslike if it has a nontrivial nilpotent normal subgroup F with a nontrivial complement H such that [F, h] = F for all nonidentity elements h is an element of H. Suppose that a finite ... 
α metrically chebyshev conformal motions in Riemannian spaces
(Academic Publications, 200802)In this paper we introduced αmetrically Chebyshev nets in a Riemannian manifold with semisymmetric metric connection. We also studied conformal motions with trajectories defined by the components of these nets in Riemannian ... 
Darboux function in a hypersurface of a Riemannian manifold with semisymmetric metric connection
(Hikari, 200810)In 1970, Yano, [1], studied Riemannian manifolds which admit semisymmetric metric connections whose curvature tensors vanish (see also [2]). The properties of a Riemannian manifold admitting a semisymmetric metric connection ... 
Nonselfadjoint sturm–liouville operators with matrix potentials
(Pleiades Publishing, 2007)We obtain asymptotic formulas for nonselfadjoint operators generated by the Sturm–Liouville system and quasiperiodic boundary conditions. Using these asymptotic formulas, we obtain conditions on the potential for which ... 
On quasirecurrent spaces with Ricci quartersymmetric metric connection
(Hikari, 200601)In [3], Mishra and Pandey defined Ricci quartersymmetric metric connection in Riemanian manifold. In [5],Uysal and Doğan defined Drecurrent spaces with semisymmetric metric connection and constructed an example of these ... 
Perturbation theory for the periodic multidimensional Schrödinger Operator and the BetheSommerfeld Conjecture
(Hikari, 2007)In this paper we obtain asymptotic formulas of arbitrary order for the Bloch eigenvalue and the Bloch function of the periodic Schr¨odinger operatör −Δ + q(x), of arbitrary dimension, when corresponding quasimomentum lies ... 
Global attractors for the 3D viscous cahnhillard equations in an unbounded domain
(Taylor & Francis, 200908)In this note the 3D viscous CahnHillard equation is considered in an unbounded domain. It is shown that the semigroup generated by this equation has a global attractor. The asymptotic compactness of the solution operator ...