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We precise the convergence behavior and prove the general convergence [2, p. 564 ] of (1) at the Runckel's points of the singular line $(1,+\\infty)$ It is shown that in some cases the convergence holds in the classical sense. 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We precise the convergence behavior and prove the general convergence [2, p. 564 ] of (1) at the Runckel's points of the singular line $(1,+\\infty)$ It is shown that in some cases the convergence holds in the classical sense. 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