NORMAL SOLVABILITY OF LINEAR DIFFERENTIAL EQUATIONS IN THE COMPLEX PLANE
Ju F Korobeĭnik · Mathematics of the USSR-Izvestiya · 1972
The operator , where and are square th order matrices, regular in a region of arbitrary connectivity, and is a single-column matrix, regular in , is investigated. The operator is shown to be normally solvable in the space of single-column matrices regular in , and in certain subspaces of , and its index is evaluated.