An Integrable System of Partial Differential Equations on the Complex Projective Group
Peter J. Vassiliou
Abstract:
We give an intrinsic construction of a coupled nonlinear
system consisting of two first order partial differential
equations in two dependent and two independent variables which is
determined by a hyperbolic structure on the Lie group of linear
fractional transformations of the complex plane, regarded as a
real Lie group G. Despite the fact that the system is not
Darboux semi-integrable at first order, the construction of a
family of solutions depending upon two arbitrary functions, each
of one variable, is reduced to a system of ordinary differential
equations on the 1-jets which is of Lie type and associated to
G.