Abstract
GRTensor is an interactive PC‐based program for tensor analysis primarily of interest for teaching and research in general relativity. It uses either M A P L E V or M A T H E M A T I C A as its algebraic engine. In this paper we use GRTensor to evaluate the Ricci and Weyl invariants for the radiating Kerr–Newman metric. This includes, as a special case, all nonvanishing invariants of the Kerr metric—the archetypical black hole solution in general relativity.
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