We consider solution operators of linear ordinary boundary problems with “too many” boundary conditions, which are not always solvable. These generalized Green’s operators are a certain kind of generalized inverses of differential operators. We answer the question when the product of two generalized Green’s operators is again a generalized Green’s operator for the product of the corresponding d...

Abstract Given a regular measure $$\eta \in M([0,1))$$ η ∈ M ( [ 0 , 1 ) and an analytic function $$g\in {\mathcal H}(\mathbb {D})$$ g...