DirectDemocracyP2P (ddp2p.net) provides an environment for electronic debates, moderated in a decentralized way by ordering justifications (aka comments) based on collaborative filtering. The intuition was that comment threading models for such systems ought to have the peculiarity that each user should be allowed to submit a single justification when voting for a given motion, unlike common fo...

1. Haldor Topsøe A/S, Nymøllevej 55, DK-2800 Kgs. Lyngby, Denmark. 2. Nano-Science Center, Niels Bohr Institute, Universitetsparken 5, DK-2100, Copenhagen, Denmark. 3. SuperSTEM Laboratory, STFC Daresbury, Keckwick Lane, Daresbury WA4 4AD, United Kingdom 4. Lawrence Berkeley National Laboratory, National Center for Electron Microscopy and Joint Center for Artificial Photosynthesis, Berkeley CA ...

A theorem of Følner asserts that for any set A ⊂ Z of positive upper density there is a Bohr neigbourhood B of 0 such that B \ (A − A) has zero density. We use this result to deduce some consequences about the structure of difference sets of sets of integers having a positive upper density.

We present a representation for the long–range part of the general 0νββ decay rate allowed by lorentz–invariance. Combined with the short range part this general parametriza-tion in terms of effective B − L violating couplings will provide the 0νββ limits on arbitrary lepton number violating theories. " One must be prepared for surprises, not anywhere but specifically with the beta decay " (Nie...

What explains the persistence of certain debates in corporate law? Many fundamental questions remain unresolved despite dozens of years of research, countless conferences, and innumerable studies, both theoretical and, more recently, empirical. This is puzzling because one would expect time and evidence to move us toward a resolution of debates about what is the most efficient way of doing some...