ABSTRACT
Suppose that the sequence A contains multiple points. If m n is the multiplicity of the point An , then we consider a system more general than (1), namely,
e(A) := (e<Ant, (t*)eiA»*,. . . , 0 •
In this case it is natural to enumerate the system biorthogonal to e(A) in the following way:
(hn,Q{t)i hn,l{t)i • • • j ^n,mn-l (^))n_o • (2) The biorthogonality of system (2) to the system e(A) means that
/ * M( , = = ,3, J 10 otherwise.
