The Hadamard variational formula for the Green functions of some normal elliptic boundary value problems
Daisuke Fujiwara, Shin Ozawa · Proceedings of the Japan Academy Series A Mathematical Sciences · 1978
Introduction.Let/2 be a bounded domain in R with the boundar,y , of class C .Let p(x), x e ., be a real smooth function de- fined on the boundary ,.For small e>__0, let 9, be the domain bound- ed by the hyper-surface .,={ye I:tn[y'--X+ep(X)vz,, X e '}, where vx de-