2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45547A problem of amplitude reconstruction in terms of the given angular distribution is considered. Solution of this problem is not unique. A class of amplitudes, correspondent to one and the same angular distribution, forms a region in projection onto a finite set of spherical harmonics. An explicit parametrization of a boundary of the region is obtained. A shape of the region of ambiguities is studied in particular example. A scheme of partial-wave analysis, which describes all solutions in the limits of the region, is proposed.15 pages, 5 figures in Uuencoded ZIP-compressed Postscript fileHigh Energy Physics - Phenomenologytext