Monotonies�tze f�r hyperbolische Anfangswertaufgaben und Einschlie�ung von L�sungen

Some hyperbolic differential operators of two dimensions are proved to be of monotone kind (see [2], p. 276), and it is shown how to use this property to enclose solutions of hyperbolic initial value problems by iteration methods with monotonicity properties. The application of the theorems is demonstrated by numerical examples.