A Maximum Principle for Periodic Solutions of the Telegraph Equation
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چکیده
Let L s L u be a linear differential operator acting on functions u: V a R that are defined on a fixed manifold V. These functions will belong to a Ž . certain family B ; F V, R , and the definition of B may include some boundary conditions or other requirements that must be satisfied by any function u g B. It is said that L satisfies the maximum principle if the differential inequality L u G 0, u g B implies u G 0 in V . w x The book 18 is devoted to the study of the maximum principle for second w x w x w x w x w x order operators. Other related results can be found in 17 , 5 , 12 , 8 , 2 , w x 14 . In this paper we study the maximum principle for periodic solutions of the telegraph equation. The operator is
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تاریخ انتشار 1998