Mathematics – Differential Geometry
Scientific paper
2008-11-24
Mathematics
Differential Geometry
Scientific paper
Some new results on geometry of classical parabolic Monge-Amp\`ere equations (PMA) are presented. PMAs are either \emph{integrable}, or \emph{nonintegrable} according to integrability of its characteristic distribution. All integrable PMAs are locally equivalent to the equation $u_{xx}=0$. We study nonintegrable PMAs by associating with each of them a 1-dimensional distribution on the corresponding first order jet manifold, called the \emph{directing distribution}. According to some property of this distribution, nonintegrable PMAs are subdivided into three classes, one \emph{generic} and two \emph{special} ones. Generic PMAs are completely characterized by their directing distributions, and we study canonical models of the latters, \emph{projective curve bundles} (PCB). A PCB is a 1-dimensional subbundle of the projectivized cotangent bundle of a 4-dimensional manifold. Differential invariants of projective curves composing such a bundle are used to construct a series of contact differential invariants for corresponding PMAs. These give a solution of the equivalence problem for generic PMAs with respect to contact transformations. The introduced invariants measure in an exact manner nonlinearity of PMAs.
Ferraioli Diego Catalano
Vinogradov Alexandre
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