A note on -chordal polygons.
A note on ovals and their evolutoides.
A note on the existence of -equivelar polyhedral maps.
A pair of general triangle inequalities.
A parametrization of equilateral triangles having integer coordinates.
A partition of the unit sphere into regions of equal area and small diameter.
A Pieri-type formula for even orthogonal Grassmannians
We study the cohomology ring of the Grassmannian G of isotropic n-subspaces of a complex 2m-dimensional vector space, endowed with a nondegenerate orthogonal form (here 1 ≤ n < m). We state and prove a formula giving the Schubert class decomposition of the cohomology products in H*(G) of general Schubert classes by "special Schubert classes", i.e. the Chern classes of the dual of the tautological vector bundle of rank n on G. We discuss some related properties of reduced decompositions of "barred...
A point set everywhere dense in the plane.
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 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 space-time theorem in the de Sitter-world. (Ein Raum-Zeit-Satz für die de Sitter-Welt.)
A supplement to Eddy's paper.
A Sylvester Theorem for Conic Sections.
A Synopsis of Elementary Results in Pure Mathematics [Book]
A synthetic approach to the taxicab circles.
A Triangle Transformation.