Focal Sets, Taut Embeddings and the Cyclides of Dupin.
Foliations by surfaces of a peculiar class
We classify surfaces in 3-dimensional space forms which have all the local conformal invariants constant and show that compact 3-manifolds of nonzero constant sectional curvature admit no foliations by such surfaces.
Foliations making a constant angle with principal directions on ellipsoids
We study the global behavior of foliations of ellipsoids by curves making a constant angle with the lines of curvature.
Foliations of hyperbolic space by constant mean curvature surfaces sharing ideal boundary.
Formes différentielles sur l'espace projectif réel sous l'action du groupe linéaire général.
Functionals with linear growth in the calculus of variations. II.
Functionals with linear growth in the calculus of variations. I.