Parametrices for pseudo-differential equations with double characteristics II
Parametrices for pseudo-differential equations with double characteristics II
In our previous paper [11] we constructed parametrices for some double characteristic pseud0-differential operators, whose characteristic sets are closed conic manifolds of codimension 2 in the cotangent space.In this paper we shall show that the condition of Theorem 1. 2 in [11] is necessary and sufficient condition for existence of …