We carry out the complete description of the \(D_{w}\)-Laguerre–Hahn forms of class zero, where \(D_{w}\) is the divided difference operator. Essentially, four canonical cases appear. Some particular cases which refer to well-known orthogonal sequences are exhibited.

中文翻译：

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零级的Laguerre–Hahn形式的$$ D_ {w} $$ D w

我们对类别为零的\（D_ {w} \）- Laguerre–Hahn形式进行完整描述，其中\（D_ {w} \）是除差算子。本质上，出现四个规范案例。展示了一些涉及众所周知的正交序列的特殊情况。