DERHAM COHOMOLOGY OF MANIFOLDS CONTAINING THE POINTS OF INFINITE TYPE, AND SOBOLEV ESTIMATES FOR THE PARTIAL-DERIVATIVE-NEUMANN PROBLEM
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We consider smooth bounded pseudoconvex domains in Cn whose boundary points of infinite type are contained in a smooth submanifold M (with or without boundary) of the boundary having its (real) tangent space at each point contained in the null space of the Levi form of b at the point. (In particular, complex submanifolds satisfy this condition.) We consider a certain one-form on b and show that it represents a De Rham cohomology class on submanifolds of the kind described. We prove that if represents the trivial cohomology class on M, then the Bergman projection and the {Mathematical expression} operator on are continuous in Sobolev norms. This happens, in particular, if M has trivial first De Rham cohomology, for instance, if M is simply connected. 1993 Mathematica Josephina, Inc.