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The Schrödinger equations which are solvable in terms of associated special func-tions are directly related to some operators defined in the theory of hypergeometric type equations. The fundamental formulae occurring in a supersymmetric approach to these Hamil-tonians or in theory of coherent states are consequences of some formulae concerning the general theory of associated special functions. We use this connection in order to obtain a general theory of Schrödinger equations solvable in terms of associated special functions, and to extend certain results known in the case of some particular potentials. a0a