Inequaltities of Yff type in triangle.
Infinite number of spheres through four tangents. (Unendlich viele Kugeln durch vier Tangenten.)
Intersection d'une surface par un plan
Invariance of regularity conditions under definable, locally Lipschitz, weakly bi-Lipschitz mappings
We describe the notion of a weakly Lipschitz mapping on a stratification. We also distinguish a class of regularity conditions that are in some sense invariant under definable, locally Lipschitz and weakly bi-Lipschitz homeomorphisms. This class includes the Whitney (B) condition and the Verdier condition.
Isodynamic systems in Euclidean spaces and an -dimensional analogue of a theorem by Pompeiu