A new proof of Morley's theorem
A Non-Commutative Incidence Group of Exponent n.
A non-Desarguesian space geometry
A non-uniqueness theorem in the theory of Voronoi sets.
A normed space with the Beckman-Quarles property.
A Note of Affine Planes with Transitive Collineation Groups.
A note on a quartic with a tacnode and a flexnode
A note on embedding and generating dual polar spaces.
A note on -chordal polygons.
A note on ovals and their evolutoides.
A note on Pappus' theorem.
A note on tensor products of polar spaces over finite fields.
A note on the derived semifield planes of order 16.
A note on the existence of -equivelar polyhedral maps.
A noteworthy property of the tridens curve in the isotropic plane.
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.