2·î15Æü(ÌÚ) 15:30 -- 17:00 Anatoly G. Yagola (Moscow State University, Russia) ``Ill-posed Problems and A Priori Information'' ¡ãAbstarct¡ä In the presentation I shall describe how to use typical a priori information (compactness of a set of solutions, sourcewise representation with completely continuous operator) for constructing effective regularizing algorithms and error estmation in ill-posed problems.