The Wave Equation on a Curved Space-TimeThis book was originally published in 1975. In Einstein's General Theory of Relativity the effects of gravitation are represented by the curvature of space time. Physical processes occurring in the presence of gravitation must then be treated mathematically in terms of their behaviour in a curved space time. One of the most basic of these processes is wave propagation, and this book gives a rigourous discussion of the local effects of curvature on the