HOMOGENEOUS IDEAL I(+)IM OF R(+)M

Ideal Homogeneous Access Structures Constructed from Graphs

Starting from a new relation between graphs and secret sharing schemes introduced by Xiao, Liu and Zhang, we show a method to construct more general ideal homogeneous access structures. The method has some advantages: it efficiently gives an ideal homogeneous access structure for the desired rank, and some conditions can be imposed (such as forbidden or necessary subsets of players), even if th...

On the Homogeneous Ideal of Unreduced Projective Schemes

Here we give upper bounds for the degrees of generators of the homogeneous ideal of a suitable unreduced scheme Z ⊂ P n. Here we take as Z a disjoint union of fat points or of multiple structures on linear subspaces or we take as Zred a subscheme of a smooth curve or a scroll. The actors in this paper are unreduced subschemes (or ”fattening”) of P n with connected components which are fattening...

Topological superconductor in quasi-one-dimensional ${\rm Tl}_{2-x}{\rm Mo}_6{\rm Se}_6$

Identifying an Honest ${\rm EXP}^{\rm NP}$ Oracle Among Many

We provide a general framework to remove short advice by formulating the following computational task for a function f : given two oracles at least one of which is honest (i.e. correctly computes f on all inputs) as well as an input, the task is to compute f on the input with the help of the oracles by a probabilistic polynomial-time machine, which we shall call a selector. We characterize the ...

Bank ownership, rm value and rm capital structure in Europe*

We investigate the role of banks in the ownership structure of non-…nancial …rms. Distinguishing between banks and other institutional investors as shareholders, we examine the relationship between …nancial institution ownership and the performance of the …rms in which they hold equity. We control explicitly for the capital structure decision of the …rms and the ownership decision of …nancial i...