Index, localization and classification of characteristic surfaces for linear partial differential operators (Q762684)

Let P(z,\(\partial)\) be a linear partial differential operator of order m with holomorphic coefficients in \(\Omega \subset C^{n+1}\), and K be a connected nonsingular hypersurface in \(\Omega\). In this paper the author gives index, localization, and classification of characteristic surfaces of P(\(\psi\),\(\partial)\).