MISKOLC MATHEMATICAL NOTES, cilt.23, sa.1, ss.521-528, 2022 (SCI-Expanded, Scopus)
In this paper, all normal extensions of the minimal operator associated with the singu-lar degenerate linear differential expressions for first order in the Hilbert space of vector-functions are investigated in terms of boundary values. As well, it analyses the spectrum parts of any nor-mal extension.