S. Aranganayagi (1), M. Saraswathi (2), K. Chitirakala (3), A. Vadivel (4) (1) Department of Mathematics, Government Arts College, Dharmapuri, Tamil Nadu-636 705, India,
(2) Department of Mathematics, Kandaswami Kandar's College P-velur, Tamil Nadu-638 182, India,
(3) Department of Mathematics, M.Kumarasamy College of Engineering, Karur - 639 113, India,
(4) Department of Mathematics, Annamalai University, Annamalai Nagar - 608 002, India