For any solution of the two-dimensional wave equation with
Chapter 9, Problem 18(choose chapter or problem)
For any solution of the two-dimensional wave equation with initial data vanishing outside some circle, prove that u(x, y,t)=O(t1) for xed (x, y)ast ;thatis, t u(x, y,t)isaboundedfunctionof t forxed xandy.Notethecontrasttothreedimensions.(Hint:Useformula(19).)
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