Exterior parallelism for polyhedra.
Formules de réduction trigonométrique
Four Problems on Dodecahedron
Four series of hyperbolic space groups with simplicial domains, and their supergroups
Frieze patterns
Generalized Sperner lemma and subdivisions into simplices of equal volume
Geometric Realizations for Dyck's Regular Map on a Surface of Genus 3.
Geometrische Krystallographie [Book]
Geometrischer Beweis der diskreten Ungleichung von W. Wirtinger
Die diskrete Ungleichung von W. Wirtinger wird aus den Eigenschaften der auf den mehrdimensionalen Raumen liegenden Polygone gefolgert.
Gleichungen vom Dehn-Sommervilleschen Typ für nicht beschränkte konvexe Polytope und für Raumzerlegungen durch Hyperebenen.
Glide Reflection and other Combined Transformations
Growth of planar Coxeter groups, P.V. numbers, and Salem numbers.
Grupy bodů přímky a rovinné konfigurace
Hinged Dissection of a Half of Rhombic Icosahedron
Hyperbolic manifolds according to Thurston and Jørgensen
Hyperplane Arrangements with a Lattice of Regions.
Idempotent semigroups and tropical algebraic sets
The tropical semifield, i.e., the real numbers enhanced by the operations of addition and maximum, serves as a base of tropical mathematics. Addition is an abelian group operation, whereas the maximum defines an idempotent semigroup structure. We address the question of the geometry of idempotent semigroups, in particular, tropical algebraic sets carrying the structure of a commutative idempotent semigroup. We show that commutative idempotent semigroups are contractible, that systems of tropical...
Identical Dual Lattices and Subdivision of Space
Incidence-Polytopes with Toroidal Cells.
Inequaltities of Yff type in triangle.