Differenzmengen und zweifach transitive Permutationsgruppen von Primzahlgrad.
Dihedral -tilings of the sphere by rhombi and triangles.
Dihedral f-tilings of the sphere by spherical triangles and equiangular well-centered quadrangles.
Dimension of the sum of several copies of a graph
Dimensions of Hyperplane Spaces over Finite Fields.
Discrepancy of matrices of zeros ond ones.
Discrete polymatroids.
Disegni divisibili e loro automorfismi
Dissections of Regular Polygons into Triangles of Equal Areas.
Distinct equilateral triangle dissections of convex regions
We define a proper triangulation to be a dissection of an integer sided equilateral triangle into smaller, integer sided equilateral triangles such that no point is the vertex of more than three of the smaller triangles. In this paper we establish necessary and sufficient conditions for a proper triangulation of a convex region to exist. Moreover we establish precisely when at least two such equilateral triangle dissections exist. We also provide necessary and sufficient conditions for some convex...
Distribution of values of permanent and standard forms of (0,1)-matrices
Distributive Steiner quasigroups of order
Divisible designs admitting a Suzuki group as an automorphism group
Si costruiscono, facendo uso delle rette dei piani di Lüneburg e degli ovali di Tits, due classi di disegni divisibili ipersemplici che ammettono il gruppo di Suzuki ( con ) come gruppo di automorfismi. Inoltre si studiano le strutture ottenute determinandone le orbite di .
Divisible tilings in the hyperbolic plane.
Do (1276, 51, 2) difference sets exist?
Domino tilings and products of Fibonacci and Pell numbers.
D-optimal weighing designs for four and five objects.
Double Resolvability of Some Complete 3-Designs.
Doubly stochastic matrices and the Bruhat order
The Bruhat order is defined in terms of an interchange operation on the set of permutation matrices of order which corresponds to the transposition of a pair of elements in a permutation. We introduce an extension of this partial order, which we call the stochastic Bruhat order, for the larger class of doubly stochastic matrices (convex hull of permutation matrices). An alternative description of this partial order is given. We define a class of special faces of induced by permutation matrices,...
Dual codes of projective planes of order 25.