Horoball packings for the Lambert-cube tilings in the hyperbolic 3-space.
How To Build a Barricade.
How to cage an egg.
How to play MetaSquares
Hyperbolic and Parabolic Packings.
Hyperbolization of Euclidean ornaments.
Hyperplane arrangements and Milnor fibrations
There are several topological spaces associated to a complex hyperplane arrangement: the complement and its boundary manifold, as well as the Milnor fiber and its own boundary. All these spaces are related in various ways, primarily by a set of interlocking fibrations. We use cohomology with coefficients in rank local systems on the complement of the arrangement to gain information on the homology of the other three spaces, and on the monodromy operators of the various fibrations.
Image sampling with quasicrystals.
Improved Bounds for the Disk-packing Constant
Improved coverings of a square with six and eight equal circles.
Improved inclusion-exclusion inequalities for simplex and orthant arrangements.
Improving dense packings of equal disks in a square.
Inequalities for lattice constrained planar convex sets.
Infinite perfekte Dreieckszerlegungen auch für gleichseitige Dreiecke.
Infinite periodic discrete minimal surfaces without self-intersections.
Inflationary tilings with a similarity structure.
Inhomogeneous extreme forms
G.F. Voronoi (1868–1908) wrote two memoirs in which he describes two reduction theories for lattices, well-suited for sphere packing and covering problems. In his first memoir a characterization of locally most economic packings is given, but a corresponding result for coverings has been missing. In this paper we bridge the two classical memoirs.By looking at the covering problem from a different perspective, we discover the missing analogue. Instead of trying to find lattices giving economical...
Integer partitions, tilings of -gons and lattices
In this paper, we study two kinds of combinatorial objects, generalized integer partitions and tilings of -gons (hexagons, octagons, decagons, etc.). We show that the sets of partitions, ordered with a simple dynamics, have the distributive lattice structure. Likewise, we show that the set of tilings of a -gon is the disjoint union of distributive lattices which we describe. We also discuss the special case of linear integer partitions, for which other dynamical models exist.
Integer Partitions, Tilings of 2D-gons and Lattices
In this paper, we study two kinds of combinatorial objects, generalized integer partitions and tilings of 2D-gons (hexagons, octagons, decagons, etc.). We show that the sets of partitions, ordered with a simple dynamics, have the distributive lattice structure. Likewise, we show that the set of tilings of a 2D-gon is the disjoint union of distributive lattices which we describe. We also discuss the special case of linear integer partitions, for which other dynamical models exist.
Integer Points on Curves and Surfaces.