Affine surfaces with planar affine normals in 3-dimensional Minkowski space .
Affine umbilical surfaces in R4.
Affinely invariant symmetry sets
The classical medial axis and symmetry set of a smooth simple plane curve M, depending as they do on circles bitangent to M, are invariant under euclidean transformations. This article surveys the various ways in which the construction has been adapted to be invariant under affine transformations. They include affine distance and area constructions, and also the 'centre symmetry set' which generalizes central symmetry. A connexion is also made with the tricentre set of a convex plane curve, which...
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An affine embedding of the gamma manifold.
An equivalence theorem for submanifolds of higher codimensions
For a submanifold of of any codimension the notion of type number is introduced. Under the assumption that the type number is greater than 1 an equivalence theorem is proved.
Applications of spectral geometry to affine and projective geometry.
Asymptotic estimates for best and stepwise approximation of convex bodies II.