A polynomial characterization of affine spaces over GF(3)
A Poncelet theorem in space.
A Power Law for the Distortion of Planar Sets.
A Problem of Mapping a Finite Set into a Set of Positive Measure
A problem on spheres in flag-spaces. (Ein Kugelproblem im Flaggenraum.)
A projective characterization of cyclicity.
A proof of Atiyah's conjecture on configurations of four points in Euclidean three-space.
A proof of two conjectures related to the Erdős-Debrunner inequality.
A rank 3 tangent complex of , odd.
A recursive construction of 1-rotational Steiner 2-designs.
A relation between the numbers of singular points and singular lines of a plane closed curve.
A Remark on the Projectivities of the Projective Line over a Commutative Ring.
A Resolution of the Sylvester-Gallai Problem of J.-P. Serre.
A Root System for the Lyons Group.
A rough classification of symmetric planes.
A sharpening of a discrete analog of Wirtinger's and isoperimetric inequalities
A sharpening of a discrete case of Wirtinger's inequality is given. It is then used to sharpen the isoperimetric unequality for polygons.
A simple proof for the theorems of Pascal and Pappus.
A simpler construction of volume polynomials for a polyhedron.
A souped-up version of Pardini's theorem and its application to funny curves
A space-time theorem in the de Sitter-world. (Ein Raum-Zeit-Satz für die de Sitter-Welt.)