Abstract
The intuitive definition of symmetry is compared with more formal definitions due to Tamburino and Winicour (1966), and to Penrose (1963), and within the context of the approach of Newman and Unti (1962) to asymptotically flat empty space-times these are shown to be equivalent. Natural interpretations of the transformations inherent in the work of Newman and Unti are given in terms of the conformal approach of Penrose.
Keywords

This publication has 9 references indexed in Scilit: