00423nam a2200121Ia 4500082002000000100002500020245014900045260004900194300001000243490003800253500000500291700000500296  a515.73bC569.AT  aCiesielski, Zbigniew  aApproximation theorybpapers presented at the Stefan Banach International Mathematical Center at the 6th semester held on Sept. 17-Dec. 17, 1975  aWarszawabPolish Scientific Publishersc1979  a316p.  aBanach Center Publicationsv v. 4  a  a