This note provides a study of lightlike hypersurfaces of a gen- eralized Robertson-Walker(GRW) space-time with a certain screen distri-bution, which are integrable and have good properties. Focus is to investi-gate geometric features from the relation of the second fundamental forms between lightlike hypersurfaces and leaves of the integrable screen distri- bution. Also, we shall apply those results on lightlike hypersurfaces of a GRW space-time to lightlike hypersurfaces of a Robertson-Walker(RW) space-time.
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