On the Realization of Convex Polytopes, Euler's Formula and Möbius Functions (Short Communication)
On the Realization of Convex Polytopes, Euler's Formula and Möbius Functions
On the Reconstruction of Latin Squares
On the resolvability of Hall triple systems
È ben noto che fra le classi di sistemi ternari di Hall (HTS), gli HTS Abeliani ammettano una risoluzione siccome sono esattamente gli spazi affini finiti d'ordine 3; per questi sistemi una tal risoluzione è fornita dalla relazione di parallelismo. In questa nota viene dimostrato che certe classi di HTS non Abeliani costrutti dai gruppi di Burnside , anche ammettono una risoluzione. Allora, questi esempi di HTS si possono considerare anche come spazi finiti di Sperner e dunque la nota conclude...
On the semigroup of binary relations on a finite set
On the sequence A079500 and its combinatorial interpretations.
On the size of dissociated bases.
On the smallest minimal blocking sets in projective space generating the whole space.
On the spectrum of resolvable orthogonal arrays invariant under the Klein group K4.
On the sprectra of certain classes of Room frames.
On the structure and classification of SOMAs: Generalizations of mutually orthogonal Latin squares.
On the Structure of Affine Designs.
On the Structure of Finite Collineation Groups Containing Symmetries of Generalized Quadrangles.
On the structure of the Steiner triple systems derived from the Steiner quadruple systems
On the sum of dilations of a set
We show that for any relatively prime integers 1 ≤ p < q and for any finite A ⊂ ℤ one has .
On the theorems of Drake and Lenz.
On the twin designs with the Ionin-type parameters.
On the union of matching matroids
On the volume of the polytope of doubly stochastic matrices.
On Translating One Polyomino To Tile the Plane.