Combinatorial Theory

Critical perfect systems of difference sets with the minimum start.- Some aspects of coding theory between probability, algebra, combinatorics and complexity theory.- Generalized SCHUR numbers.- Description of spherically invariant random processes by means of g-functions.- Geometries for the mathieu group M12.- Orbits and enumeration.- Pictures and skew (reverse) plane partitions.- A canonical partition theorem for chains in regular trees.- Incidence algebras, exponential formulas and unipotent groups.- On irreducible translation planes in odd characteristic, I.- The equivalence classes of the Vasil'ev codes of length 15.- On the new projective planes of R. Figueroa.- Counting symmetry classes of functions by weight and automorphism group.- Quadruple systems over Zp admitting the affine group.- Arcs and ovals in steiner triple systems.- On dedekind numbers.- Regular sets and quasi-symmetric 2-designs.- Asymptotic 0¿1 laws in combinatorics.- Generalized block designs as approximations for optimal coverings.- A graphic theory of associativity and wordchain patterns.- Elusive properties.