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Abstract A coherent self-contained account of the equations governing the perturbations of the Schwarzschild black hole is given. In particular, the relations between the equations of Bardeen Vishveshwara 1970; Edelstein Zerilli 1970 a, b; Fackerell 1971; Bardeen Friedman 1973). Nevertheless, there continues to be some elements of mystery shrouding the subject. Thus, Zerilli (1970a) showed that the equations governing the perturbation, properly analysed into spherical harmonics (belonging to the different l values) and with a time dependence iot, can be reduced to a one dimensional Schrodinger equation of the form
S. Chandrasekhar (Tue,) studied this question.