The Beckman-Quarles theorem for mappings from to .
The best constant for a geometric inequality.
The best constant for an algebraic inequality.
The best constants for a double inequality in a triangle.
The Betten-Walker spread and Cayley's ruled cubic surface.
The Boundary at Infinity of a Rough CAT(0) Space
We develop the boundary theory of rough CAT(0) spaces, a class of length spaces that contains both Gromov hyperbolic length spaces and CAT(0) spaces. The resulting theory generalizes the common features of the Gromov boundary of a Gromov hyperbolic length space and the ideal boundary of a complete CAT(0) space. It is not assumed that the spaces are geodesic or proper
The Cayley–Menger determinant is irreducible for .
The CC-version of Stewart's theorem.
The chromatic index of cyclic Steiner 2-designs.
The classification of compact hyperbolic Coxeter d-polytopes with d + 2 facets.
The classification of compact right chain rings.
The classification of generalized quadrangles with two translation points.
The Classification of Quasi-Regular Polyhedra of Genus 2.
The classification of SPG-systems of index 2.
The classification of spreads in admitting linear groups of order . II: Even order.
The classification of subplane covered nets.
The Coexistence of Elations and Homologies.
The Collineation Groups of Derived Translation Planes. II.
The combinatorial structure of trigonometry.
The combinatorially regular polyhedra of index 2.