On self-adjoint operators generated by the fourth-order Laguerre type differential expression

Orthogonal polynomials and functions of hypergeometric type (Jacobi, Laguerre, Hermite, Askey scheme, etc.) (33C45) Orthogonal functions and polynomials, general theory of nontrigonometric harmonic analysis (42C05) Linear symmetric and selfadjoint operators (unbounded) (47B25) Other functions coming from differential, difference and integral equations (33E30)

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