Local Solvability of Operators with Principal Symbol ξ²₁+…+ξ²_n−1+x²_nξ²_n in the Spaces of Distributions and Ultradistributions

抄録

In this paper we shall illustrate how to study local solvability in the spaces of distributions and ultradistributions through the studies on operators of a special form. We shall give necessary conditions and sufficient conditions for these operators.