
doi: 10.1007/bf02419735
Nel tomo 1° di questi Annali (pagina 241)1) mi dolsi di non aver potuto scoprire una prova diretta della uguaglianza $${\left( {\frac{x}{2}} \right)^a}\int\limits_0^\infty {{e^{ - x\cosh \theta }}} sen{h^{2a}}\theta d\theta = \frac{{\Gamma (a + \frac{1}{2})}}{{\Gamma \left( {\frac{1}{2}} \right)}}\int\limits_0^\infty {{e^{ - x\cosh \theta }}} \cosh a\theta d\theta ;$$ (a) ora veggo che ne fornisce il mezzo un teorema di Jacobi 2), presentato sotto una forma alquanto piu generale.
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