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