A convex Darboux theorem
A generalization of the exterior product of differential forms combining Hom-valued forms
This article deals with vector valued differential forms on -manifolds. As a generalization of the exterior product, we introduce an operator that combines -valued forms with -valued forms. We discuss the main properties of this operator such as (multi)linearity, associativity and its behavior under pullbacks, push-outs, exterior differentiation of forms, etc. Finally we present applications for Lie groups and fiber bundles.
A map associated to the Lepagian forms on the calculus of variations in fibred manifolds
A remark on linear functions on the sphere
Abstract exterior differential
Affine differential invariants for planar curves.
An inverse problem in the economic theory of demand
Automorphism Groups of Classical Mechanical Systems.