An eigenvalue problem for vibrating strings with concave densities

An eigenvalue problem for vibrating strings with concave densities
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DOI:
10.1016/j.aml.2012.05.001
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发表时间:
2012-12
期刊:
Appl. Math. Lett.
影响因子:
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通讯作者:
Yan-Hsiou Cheng
Yan-Hsiou Cheng
中科院分区:
其他
文献类型:
--
作者:
Yan-Hsiou Cheng

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本文研究了具有凹密度的弦方程的Dirichlet和Neumann特征值的阶。一般情况下,第k个Dirichlet特征值和第(k+1)个Neumann特征值的阶数是不确定的.但是,如果密度函数ρ在(0,1)上是凹的,我们证明了第二个Neumann特征值大于或等于第一个Dirichlet特征值;等式成立当且仅当ρ是常数。
In this paper, we study the order of the Dirichlet and Neumann eigenvalues for the string equation with concave densities. In general, the order of the k-th Dirichlet eigenvalue and (k+1)-th Neumann eigenvalue is indeterminate. But, if the density function ρ is concave on (0,1), we show that the second Neumann eigenvalue is greater than or equal to the first Dirichlet eigenvalue; the equality holds if and only if ρ is constant.