On the basic contrasts in PBIB designs
On the block structure of PBIB designs.
On the center of the fundamental group of the complement of a hyperplane arrangement.
On the chromatic number of simple triangle-free triple systems.
On the combinatorial structure of -matrices representing nonobtuse simplices
A -simplex is the convex hull of affinely independent vertices of the unit -cube . It is nonobtuse if none of its dihedral angles is obtuse, and acute if additionally none of them is right. Acute -simplices in can be represented by -matrices of size whose Gramians have an inverse that is strictly diagonally dominant, with negative off-diagonal entries. In this paper, we will prove that the positive part of the transposed inverse of is doubly stochastic and has the same support...
On the completion of incomplete latin squares.
On the Construction and Characterisation of a Class of Designs.
On the construction of cyclic quadruple systems
On the construction of non-isomorphic Steiner quadruple systems
On the convex hull of projective planes
We study the finite projective planes with linear programming models. We give a complete description of the convex hull of the finite projective planes of order 2. We give some integer linear programming models whose solution are, either a finite projective (or affine) plane of order n, or a (n+2)-arc.
On the Coordinatization of Oriented Matroids.
On the Covering Multiplicity of Lattices.
On the entry sum of cyclotomic arrays.
On the excluded minors for matroids of branch-width three.
On the existence of (196,91,42) Hadamard difference sets
On the Existence of an Infinite Family of Simple 5-Designs.
On the existence of -SOLSSOMs.
On the existence of MOLS with equal-sized holes.
On the Existence of Room Squares
On the Existence of Room Squares of Order 4n