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For anisotropic superconductors, the gap function belongs to an irreduciblerepresentation of the point group of crystals, which determines the nodalstructure of the gap function. Impurity effects on anisotropic superconductorshave been treated by the Born or T-matrix approximation by which only a partialsum of the pertutbation series is calculated. Instead, we take into acount allterms of the perturbation series. As a result, we find that the introduction ofnonmagnetic impurities does not change the nodal structure in all cases. Wealso find how to obtain nodes of the gap function and show the list for$O_{h}$, $D_{4h}$, and $D_{6h}$.

Impurity Effects on the Nodal Structure of Anisotropic Superconductors