Asymptotic distribution of eigenvalues for elliptic boundary value problems
Lech Zieliński · Asymptotic Analysis · 1998
We consider the Weyl formula describing the asymptotic behaviour of the number of eigenvalues $N(\lambda)$ for elliptic boundary value problems. The remainder estimate of the form $N(\lambda){\rm O}(\lambda^{-\mu})$ is proved with $\mu