S. JAFARI 1, N. RAJESH 2 AND R. SARANYA 3 1. College of Vestsjaelland South, Herrestraede 11, 4200 Slagelse DENMARK.
e-mail:jafaripersia@gmail.com
2. Department of Mathematics, Rajah Serfoji Govt. College Thanjavur-613005 Tamilnadu, INDIA.
e-mail: nrajesh topology@yahoo.co.in
3. 1/82, South Street, Pillaiyarnatham Thnangudi, Thanjavur 613 601 Tamilnadu, INDIA.
e-mail: sara.rengaraj@gmail.com