Let ν ≥ −1/2 and (ρ k ) k∈N be a sequence of nonzero complex numbers such that ρof Bessel functions of the first kind of index ν ≥ −1/2 is exact (i.e. complete and minimal) in the space L 2 (0; 1), then its biorthogonal system is also exact in L 2 (0; 1).
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