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On the Integration Methods of Bergman and Leroux
註釋In a previous note a correspondence was found between the representations of solutions of the canonical form of the linear hyperbolic differential equation in two independent varaibles which have been given by S. Bergman and J. Le Roux. This correspondence has the disadvantage that to regular kernel functions in the sense of Le Roux there may correspond singular kernel functions in the sense of Bergman. The purpose of the present note is to give a second correspondence which avoids this difficulty.