The Conference on Approximation Theory held in Poznan, August 22-26, . 1972, was organized jointly by the Mathematical Institute of the Polish Academy of Sciences and the Institute of Mathematics of the Adam Mickiewicz University. These proceedings contain part of the papers presented during the conference. This volume can be regarded in a sense as a continuation of the Proceedings of the Conference on Constructive Function Theory, Varna 1970, and the Proceedings of the Conference on Constructive Theory of Functions, Budapest 1969. z. CIESIELSKI and J. MUSIELAK LIST OF PARTICIPANTS Poland 1. J. Adamska 2. G. Albinus GDR Poland 3. J. A1brycht 4. A. Alexiewicz Poland 5. W. Arend Poland 6. V. V. Arestov USSR 7. M. -B. A. Babaev USSR 8. V. A. Baskakov USSR 9. V. 1. Belyj USSR 10. V. 1. Berdyshev USSR 11. S. Bergman USA 12. H. -P. Blatt GFR 13. J. Bochenek Poland 14. A. Borucka-Cie lewicz Poland 15. D. Braess GFR 16. W. W. Breckner Rumania 17. B. Brosowski GFR 18. Z. Ciesielski Poland 19. R. Denchev Bulgaria 20. S. Dimiev Bulgaria 21. B. Dreseler GFR 22. K. Fanta Hungary 23. T. L. Fields Canada 24. G. Freud Hungary 25. P. M. Gauthier USA 26. E. Gorlich GFR 27. M. v. Golitschek GFR 28.L. Y. Hedberg Sweden 29. T. Hedberg Sweden 30. K. H. Hoffmann GFR 31. J. Hojdar (:SSR 32. T. Iwinski Poland 33. A. Janicki Poland 34. M. Jaroszewska Poland 35. H. H. KaIlioniemi Sweden 36. M. KarpiD.

The Conference on Approximation Theory held in Poznan, August 22-26, . 1972, was organized jointly by the Mathematical Institute of the Polish Academy of Sciences and the Institute of Mathematics of the Adam Mickiewicz University. These proceedings contain part of the papers presented during the conference. This volume can be regarded in a sense as a continuation of the Proceedings of the Conference on Constructive Function Theory, Varna 1970, and the Proceedings of the Conference on Constructive Theory of Functions, Budapest 1969. z. CIESIELSKI and J. MUSIELAK LIST OF PARTICIPANTS Poland 1. J. Adamska 2. G. Albinus GDR Poland 3. J. A1brycht 4. A. Alexiewicz Poland 5. W. Arend Poland 6. V. V. Arestov USSR 7. M. -B. A. Babaev USSR 8. V. A. Baskakov USSR 9. V. 1. Belyj USSR 10. V. 1. Berdyshev USSR 11. S. Bergman USA 12. H. -P. Blatt GFR 13. J. Bochenek Poland 14. A. Borucka-Cie lewicz Poland 15. D. Braess GFR 16. W. W. Breckner Rumania 17. B. Brosowski GFR 18. Z. Ciesielski Poland 19. R. Denchev Bulgaria 20. S. Dimiev Bulgaria 21. B. Dreseler GFR 22. K. Fanta Hungary 23. T. L. Fields Canada 24. G. Freud Hungary 25. P. M. Gauthier USA 26. E. Gorlich GFR 27. M. v. Golitschek GFR 28.L. Y. Hedberg Sweden 29. T. Hedberg Sweden 30. K. H. Hoffmann GFR 31. J. Hojdar (:SSR 32. T. Iwinski Poland 33. A. Janicki Poland 34. M. Jaroszewska Poland 35. H. H. KaIlioniemi Sweden 36. M. KarpiD.