We prove that every smooth CR manifold $M\subset\subset \C^n$, of hypersurface type, has a complex strip-manifold extension in $\C^n$. If $M$ is, in addition, pseudoconvex-oriented, it is the "exterior" boundary of the strip. In turn, the strip extends to a variety with boundary $M$ (Rothstein-Sperling Theorem); in case $M$ is contained in a pseudoconvex boundary with no complex tangencies, the variety is embedded in $\C^n$. Altogether we get: $M$ is the boundary of a variety (Harvey-Lawson Theorem); if $M$ is pseudoconvex oriented the singularities of the variety are isolated in the interior; if $M$ lies in a pseudoconvex boundary, the variety is embedded in $\C^n$ (and is still smooth at $M$)
CITATION STYLE
Boundaries of Analytic Varieties. (2008). In Several Complex Variables and Banach Algebras (pp. 155–169). Springer New York. https://doi.org/10.1007/978-0-387-22586-9_19
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