3rd International Conference on Applied Mathematics and Approximation Theory (AMAT), Ankara, Türkiye, 28 - 31 Mayıs 2015, cilt.155, ss.299-311
Based on Vishik's method on the description of solvable extensions of a densely defined operator all solvable extensions of the minimal operator generated by some delay differential-operator expression for first order in the Hilbert space of vector-functions at finite interval are described. Later on, the structure of spectrum of these extensions is surveyed.