O Hadamardově determinantu
O počtu tříd silně ekvivalentních incidenčních matic
On a combinatorical problem of K. Zarankiewicz
On a conjecture of the semigroup of fully indecomposable relations
On a construction of regular Hadamard matrices
We give a construction for regular Hadamard matrices of order where is the order of a Hadamard matrix and is the order of a regular Hadamard matrix. The construction can be used to construct regular Hadamard matrices with special properties and includes several constructions which have been given previously. In the final section we consider the case in more detail.
On cardinalities of row spaces of Boolean matrices.
On Difference Matrices, Resolvable Transversal Designs and Generalized Hadamard Matrices.
On idempotent binary relations on a finite set
On large random almost euclidean bases.
On powers of non-negative matrices
On special structure of graphs having the maximal eigenvalue greater than two.
On Spectral Structure Of Graphs Having The Maximal Eigenvalue Not Grater Than Two
On Supplementary Difference Sets.
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 Construction and Characterisation of a Class of Designs.
On the existence of (196,91,42) Hadamard difference sets
On the exponent of -regular primitive matrices.
On the number of possible row and column sums of -matrices.
On the semigroup of binary relations on a finite set
On the twin designs with the Ionin-type parameters.