Differential invariants for parametrized projective surfaces

Gloria Marí Beffa, Peter J. Olver
1999 Communications in analysis and geometry  
We classify the differential invariants and moving frames for surfaces in projective space under the action of the projective group. The role of these results in the analysis of Adler-Gel'fand-Dikii flows that arise in inverse scattering and solitons is explained.
doi:10.4310/cag.1999.v7.n4.a6 fatcat:vivhu673mzcxzb3sh6jvjj4edu