Adjoints and formal adjoints of matrices of unbounded operators
Manfred Möller, Franciszek Hugon Szafraniec · Proceedings of the American Mathematical Society · 2008
In this paper we discuss diverse aspects of the mutual relationship between adjoints and formal adjoints of unbounded operators bearing a matrix structure. We emphasize the behaviour of row and column operators as they turn out to be the germs of an arbitrary matrix operator, providing most of the information about the latter as it is the troublemaker.