## YANO Atsushi,

## Geometric characterization of Monge-Ampère equations.

## Hokkaido Mathematical Journal, 41 (2012) pp.409-440

### Fulltext

PDF### Abstract

It is well known that a Monge-Ampère equation can be expressed in terms of exterior differential system—Monge-Ampère system, which is the ideal generated algebraically by a contact form and a 2-form and its exterior derivatives on a 5-dimensional contact manifold, and the system is independent of the choice of coordinate system. On the other hand, a single second order partial differential equation of one unknown function with two independent variables corresponds to the differential system on a hypersurface of Lagrange-Grassmann bundle over a 5-dimensional contact manifold obtained by restricting its canonical system to the hypersurface. We observe relations between Monge characteristic systems of Monge-Ampère equation and those of Monge-Ampère system and particularly analyze structure equations of those systems. This observation leads to the result—to characterize Monge-Ampère equation by the property that the certain differential system defined from the Monge characteristic system drops down to the contact manifold.

MSC(Primary) | 58A15 |
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MSC(Secondary) | 53D10 |

Uncontrolled Keywords | differential system, exterior differential system, partial differential equation, Monge-Ampere equation, Goursat equation, Monge characteristic system |