Invited Lectures in Seminars, Conferences, Symposia etc.
  1. 40 minutes, Key note address delivered in the International Conference on Mathematical Modelling of Non-linear Systems held at the Department of Mathematics, Indian Institute of Technology, Kharagpur, Dec. 1999.
  2. One-hour, Key note address delivered in the 12th Annual Conference of the Ramanujan Mathematical Society, JNN College of Engineering, Shimoga, India, May 1997
  3. One-hour, Seminaire d'Analyse Convexe, Department des Sciences Mathematiques, Universite Montpellier II, Montpellier, France, Dec. 1996.
  4. One-hour, Seminaire d'Optimisation et Recherche Operationnelle, CUST, Universite Blaise Pascal, Department de Mathematiques Appliquees, Clermont-Ferrand, France, Dec. 1996.
  5. One-hour,Seminaire de l'equipe Modelisation Geometrique et Approximation, Universite Joseph Fourier de Grenoble, LMC-IMAG, Grenoble, France, Nov.1996.
  6. One-hour, Seminaire de l'equipe Analyse Non-lineaire et Optimisation, LACO, Faculte des Sciences, Universite de Limoges, Limoges, France, Nov. 1996.
  7. One-hour, Symposium in Analysis (under DSA programme of UGC), Department of Mathematics, University of Pune, Pune, March 1995.
  8. Half-hour, Symposium in Approximation Theory at the Annual Conference of Indian Mathematical Society, Pune, Dec. 1994.
  9. Half-hour, International Conference on Advances in Computational Mathematics, IGNOU, New Delhi, Jan. 1993.
  10. Half-hour, Symposium in Applied Functional Analysis at Mathematics Section of the 77th Session of the Indian Science Congress, Jan. 1990.
  11. Half-hour, Symposium on Numerical Analysis, Approximation Theory and Computer Science, in : Indian Mathematical Society Conference, Delhi, India, Dec. 1989.
  12. One-hour, International Conference on Approximation Theory and Finite Elements, Jabalpur, India, Dec. 1989.
  13. One-hour, Southern California Functional Analysis Seminar, Los Angeles, U.S.A., May, 1988.
  14. Half-hour Symposium on Optimization, Design of Experiments and Graph Theory, I.I.T., Bombay, India, Dec. 1986.
  15. Half-hour, The Seventh International Conference on Nonlinear Analysis and Applications, Arlington, Texas, U.S.A. August 1986. .20-minutes,Conference in Approximation Theory in honour of Prof. A. Sharma, The University of Alberta, Edmonton, Canada, July 1986.
  16. Half-hour, Symposium on Advances in Functional Analysis, in : The 76th Session of the Indian Science Congress, Delhi, India 1986.
  17. One-hour, International Conference on Constructive Function Theory and Applications, Jabalpur, India, Dec. 1984.
  18. One-hour, International Conference on Approximation Theory, Memorial University Newfoundland, St. John's, Newfoundland, Canada, July 1984.
  19. Half-hour, Symposium on Approximation Theory and its Applications, in : The 70th Session of the Indian Science Congress, Tirupathi, India, Jan. 1983.
  20. One-hour International Symposium on Spline Theory and its Applications, Jabalpur, India, Jan. 1982.
  21. Half-hour, The Mathematics Section of The 66th Session of the Indian Science Congress, Osmania University, Hyderabad, India, Jan. 1979.
  22. Half-hour International Conference on Optimization in Statistics, I.I.T., Bombay, India, Dec. 1977.
  23. 2-of-1-hr each Symposium on Generalized Spaces and Fluid Dynamics, Surat, India, June 1977.
  24. Half-hour Advances in Mathematics, Silver Jubilee Seminar, Indian Institute of Technology, Kharagpur, India, 1976.
  25. One-hourColloquium Lecture, Centre d'Analyse Fonctionnelle, L'Institute de Mathe;matique, Universite; de Lie;ge, Lie;ge, Belgium, Dec. 1973.
  26. Half-hourInternational Conference on Functional Analysis and its Applications, Madras, India, Jan. 1973.

Some other Lectures
  1. One-hour,Colloquium Lecture, Department of Mathematics & Computer Science, California State University, Los Angeles, CA, U.S.A., Jan. 1988.
  2. One-hour,Functional Analysis Seminar, University of Southern California, Los Angeles, CA, Feb., 1988.
  3. One-hour, Colloquium Lecture, University of California, Davis, CA, May, 1988.
  4. One-hour,Optimization Seminar, University of Illinois at Urbana-Champaign, Urbana, IL, Sept. 1988.
  5. 20-minutes,The Second Edmonton Conference on Approximation Theory, The University of Alberta, Edmonton, Canada, June 1982.
  6. One-hour, Colloquium Lecture, The Department of Mathematical Sciences, Lakehead University, Thunderbay, Ontario, Canada, June 1982.
  7. One-hour, Colloquium Lecture, The Department of Mathematics and Statistics, Memorial University, Newfoundland, St. John's, Newfoundland, Canada, July 1982.
  8. Half-hour,The 11th Congress of the Dutch Mathematical Society, Utrecht, Holland, March 1974.
  9. 1-and-half-hour, Algemeen Wiskunde Colloquium, Department of Mathematics, Technological University, Eindhoven, The Netherlands, Dec. 1974.
  10. 1-and-half-hour, Algemeen Wiskunde Colloquium, Department of Mathematics, Technological University, Twente, Enschede, The Netherlands, Oct. 1974.
  11. One-hour,Seminaire d'Analyse Numerique, University of Grenoble, Grenoble, France, Feb. 1974.
  12. One-hour,The 5th Seminar in Analysis, MATSCIENCE, Bangalore, India, 1972.
  13. One-hour, The 4th MASTECH Conference on Functional Analysis and Its Applications, Bangalore, India, 1971.
  14. One-hour,The 4th Seminar in Analysis, MATSCIENCE, Ootacmund, India, 1971.
  15. Half-hour,Indian Mathematical Society Conference, Gorakhpur, India, 1970.