Exterior Differential Systems

Exterior differential systems
Proceedings of the 1980 Beijing Symposium on Differential Geometry and Differential Equations. 1,2,3 (1982) 219-338 Science Press, Beijing.


  [ exteriordifferential.pdf

Pfaffian Systems in Involution
Proceedings of the 1982 Beijing Symposium on Differential Geometry and Differential Equations. (1982)

Some aspects of exterior differential systems. Complex geometry and Lie theory
Proceedings of Symposia in Pure Mathematics, Sundance, UT,1989. 53 (1991) 151-173 Amer. Math. Soc., Providence, R.I..

Characteristic cohomology of differential systems, I. General theory
Journal of the American Mathematical Society. 8 no. 3 (1995) 507-596.


  [ charcohomol.pdf

Hyperbolic exterior differential systems and their conservation laws. I.
Selecta Mathematica. New Series. 1 no. 1 (1995) 21-112.


  [ hyperex1.pdf

Hyperbolic exterior differential systems and their conservation laws. II
Selecta Mathematica. New Series. 1 no. 2 (1995) 265-323.


  [ hyperex2.pdf

Toward a geometry of differential equations
Geometry, Topology, & Physics, for Raoul Bott, edited by S.-T. Yau. (1995) 1-76 International Press, Boston.