DM
2008
13 years 4 months ago
2008
A pooling space is a ranked poset P such that the subposet w+ induced by the elements above w is atomic for each element w of P. Pooling spaces were introduced in [Discrete Mathem...
DM
2008
13 years 4 months ago
2008
We introduce a new graph for all whose cartesian powers the vertex isoperimetric problem has nested solutions. This is the fourth kind of graphs with this property besides the wel...
DM
2008
13 years 4 months ago
2008
Catalan numbers C(n) = 1 n+1 2n n enumerate binary trees and Dyck paths. The distribution of paths with respect to their number k of factors is given by ballot numbers B(n, k) = n-...
DM
2008
13 years 4 months ago
2008
Rahilly [10] described a construction that relates any Hadamard design H on 4m -1 points with a line spread to an affine design having the same parameters as the classical design ...
DM
2008
13 years 4 months ago
2008
A homogeneous factorisation of a digraph consists of a partition P = {P1, . . . , Pk} of the arc set A and two vertex-transitive subgroups M G Aut() such that M fixes each Pi set...
DM
2008
13 years 4 months ago
2008
DM
2008
13 years 4 months ago
2008
The core of a game v on N, which is the set of additive games dominating v such that (N) = v(N), is a central notion in cooperative game theory, decision making and in combinator...
DM
2008
13 years 4 months ago
2008
DM
2008
13 years 4 months ago
2008
DM
2008
13 years 4 months ago
2008