In Exterior Differential Systems, the authors present the results of their ongoing development of a theory of the geometry of differential equations, focusing e

In Exterior Differential Systems, the authors present the results of their ongoing development of a theory of the geometry of differential equations, focusing e

This book introduces new methods in the theory of partial differential equations derivable from a Lagrangian. These methods constitute, in part, an extension to

Our understanding of the fundamental processes of the natural world is based to a large extent on partial differential equations (PDEs). The second edition of P