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P.K. Jain (b.1942) is reader in the Department of Mathematics, University of Delhi, Delhi. He was a Visiting Professor of Mathematics at the University of Khartoum (Sudan) for two years and at Kuwait University (Kuwait) for one year. He visited universities in U.S.A. and Canada delivering invited talks. He has been teaching at the University of Delhi for the last 22 years. He has published around 100 research papers in areas of analysis in various national and international journals and produced 11 Ph.D.s. Khalil Ahmad (b.1949) is reader in the Department of Mathematics, Jamia Millia Islamia, New Delhi. He has been teaching undergraduate and postgraduate classes for the last 16 years. He had also taught in D.A.V. College, Kanpur (Kanpur University) and A.M.U. Aligarh. He has published ten research papers in Functional Analysis in various national and international journals.