A link between global solvability and solvability over compacts for systems like :
A Partial Solution of the Pompeiu Problem.
A remark about elliptic overdeterminated systems
A remark on certain overdetermined systems of partial differential equations
A splitting theory for the space of distributions
The splitting problem is studied for short exact sequences consisting of countable projective limits of DFN-spaces (*) 0 → F → X → G → 0, where F or G are isomorphic to the space of distributions D'. It is proved that every sequence (*) splits for F ≃ D' iff G is a subspace of D' and that, for ultrabornological F, every sequence (*) splits for G ≃ D' iff F is a quotient of D'
A symmetry result for a fourth order overdetermined boundary value problem.
An Approximation Theorem for Integrable Harmonic Vector Fields.
An elementary theory of hyperfunctions and microfunctions
An inverse Neumann problem.