We investigate the Cauchy problem for second order hyperbolic equations of complete form, and we prove an extension of a classical result of Ole?inik  concerning the well-posedness for equations in which are absent the terms with mixed time-space derivatives. Then, in space dimension n = 1, we compare our results with those in  for equations with analytic coefficients, and those of  and  for homogeneous equations with coefficients depending only either on t or on x. Moreover we exhibit, in space dimension n≥ 2, an equation of the form where the coefficients are analytic functions, for which the Cauchy problem is ill-posed. Finally, we present a sufficient condition for the well-posedness of 2× 2 systems.
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|Titolo:||Some results on the well-posedness for second order linear equations|
|Data di pubblicazione:||2009|
|Appare nelle tipologie:||1.1 Articolo in rivista|