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首先考虑如下弦振动方程:
直接计算可得
进而有
令
参考文献：
[1] I. Lasiecka and R. Triggiani, Control Theory for Partial Differential Equations: Continuous and Approximation Theories, Vol.II, Cambridge University Press, Cambridge, 2000.
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来自： 人老颠东 > 《物理随笔》
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