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11: 3.7 Ordinary Differential Equations
For classification of singularities of (3.7.1) and expansions of solutions in the neighborhoods of singularities, see §2.7. …
12: 1.13 Differential Equations
For classification of singularities of (1.13.1) and expansions of solutions in the neighborhoods of singularities, see §2.7. …
13: 18.27 q -Hahn Class
A (nonexhaustive) classification of such systems of OP’s was made by Hahn (1949). … Some of the systems of OP’s that occur in the classification do not have a unique orthogonality property. …
14: 18.28 Askey–Wilson Class
They have to be included in the classification by Leonard (1982), mentioned in §18.28(viii). …