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Weyl law : ウィキペディア英語版
Weyl law
In mathematics, especially spectral theory, Weyl's law describes the asymptotic behavior of eigenvalues of the Laplace–Beltrami operator. This description was discovered in 1911 by Hermann Weyl for eigenvalues for the Laplace–Beltrami operator acting on functions that vanish at the boundary of a bounded domain \Omega \subset \mathbb^d. In particular, he proved that the number, N(x), of Dirichlet eigenvalues (counting their multiplicities) less than or equal to x satisfies
:
\lim_ \frac \omega_d \mathrm(\Omega)

where \omega_d is a volume of the unit ball in \mathbb^d. In 1912 he provided a new proof based on variational methods.〔For a proof in English, see See chapter 11.〕
==Improved remainder estimate==
The remainder estimate above o(\lambda^) has been improved by many authors up to O(\lambda^) and even to two-term asymptotics with the remainder estimate o(\lambda^) (Weyl conjecture), or even marginally better.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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