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Zeros of Bessel functions by means of the Trefftz-Fichera orthogonal invariants method through the Schrödinger equation

Vincenzo Grecchi — 1977

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

Applicando il metodo degli invarianti ortogonali di Trefftz-Fichera ad un operatore derivato dalla equazione di Schrôdinger indipendente dal tempo, si approssimano gli zeri positivi delle funzioni di Bessel di prima specie. Come casi particolari si riottengono i classici risultati di Eulero, Rayleigh e Cayley. A titolo di esempio si fa un calcolo numerico del primo zero positivo della funzione di Bessel di prima specie J 1 ( x ) , ottenendo 24 cifre esatte. Si generalizza poi il metodo di Eulero per il calcolo...

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