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Showing 1 to 1 of 1 for “"Extended Hilbert space."”.
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The sixth-order Krall differential expression and self-adjoint operators.
… by the Krall differential equation in the extended Hilbert space L2(-1, 1) + C2 which has the Krall polynomials as (orthogonal) eigenfunctions. The theory we use to create this self-adjoint operator was developed recently by L. L. Littlejohn and R. Wellman as an application of the general …