Using the method of nonlinear Lie algebra, the tensors of ladder operators are obtained.

用非线性李代数方法 ，对关于角动量的阶梯算符进行了研究。

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Some recursive relations were derived for the radial matrix elements of Hydrogenic Atom using hypervirial Theorem and ladder operators.

本文使用超维里定理与升降算符方法，导出了氢原子跃迁矩阵元与平均值计算的一些递推关系式。

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