R. D. Sarma is Reader in the Department of Mathematics at Rajdhani College, New Delhi. He has over 13 years of teaching experience at the undergraduate and post-graduate level. He has published 20 research papers in various international journals and has undertaken several research projects under U.G.C. and C.S.I.R. His primary areas of interest are fuzzy set theory and topology. He has also worked as an associate professor in mathematics in the Eritrea Institute of Technology, Eritrea, under the aegis of The Ministry of Education, Eritrea. Umesh Kumar is a lecturer in the Department of Mathematics at Rajdhani College, New Delhi. He is an active member of The Mathematical Association of India (Delhi Chapter) and a life member of Indian Mathematical Society and Indian Science Congress Association. His area of research is topology.