Oscillation of Elliptic Equations in General Domains
Ezzat S. Noussair · Canadian Journal of Mathematics · 1975
Oscillation criteria will be obtained for the linear elliptic partial differential equation in an unbounded domain G of general type in n-dimensional Euclidean space En. The differential operator D is defined as usual by where each α (i), i = 1, … , n, is a non-negative integer.