A bifurcation of multiple eigenvalues and eigenfunctions for boundary value problems in a domain with a small hole
Nguyễn Minh Trí · Institutional Repositories DataBase (IRDB) · 1994
In the present paper we study the asymptotic expansion of the multiple eigenvalues and eigenfunctions for boundary value problems in a domain with a small hole. We prove the bifurcation of these eigenvalues under certain conditions.