Recently an unlinkable version of the U-Prove attributebased credential scheme was proposed at Financial Crypto ’14 [9]. Unfortunately, the new scheme is forgeable: if sufficiently many users work together then they can construct new credentials, containing any set of attributes of their choice, without any involvement of the issuer. In this note we show how they can achieve this and we point o...

Geography of the Family by Kai A. Konrad, Harald Künemund, Kjell Erik Lommerud and Julio R. Robledo We study the residential choice of siblings who are altruistic towards their parents. The first-born child’s location choice influences the behavior of the second-born child and can shift some of the burden of providing care for the parents from one child to the other. These strategic considerati...

The aim of this study was to examine the birthdates distribution of French male soccer players (n = 363,590) who dropped out during or after the 2006-2007 season, to determine whether the relative age effect is linked to dropout behaviour. An over-representation of players born late in the competitive year was observed among dropouts, from the U-9 to the U-18 age categories, whereas their count...

where Jx = Gr(Tx(M), n) is the Grassmann manifold of all n-dimensional subspaces of the tangent space Tx(M) to M at x. Each element u ∈ J(M,n) is a linear subspace of Tx(M) of codimension m, where x = π(u). Hence we have a differential system C of codimension m on J(M,n) by putting: C(u) = π−1 ∗ (u) ⊂ Tu(J(M,n)) π∗ −→ Tx(M). for each u ∈ J(M,n). C is called the Canonical System on J(M,n). We ca...

Increased experimentation with easily accessible synthetic opioids is posing a hazard to the public. We discuss one such synthetic opioid, U-50488. Much is unknown about U-50488; however, due to its structural similarity to U-47700, there is possible risk associated with its use. Curtailing the use of synthetic opioids such as U-50488 will require a concerted effort targeting multiple problems.

Although most commonly occur r ing de fau l t ru les are normal when viewed in i s o l a t i o n , they can i n te rac t w i t h each other in ways tha t lead to the de r i va t i on of anomalous de fau l t assumptions* In order to deal w i t h such anomalies i t i s necessary to re-represent these r u l e s , in some cases by In t roducing non-normal d e f a u l t s . The need to consider such...

Making agreements on how to behave has been shown to be an evolutionarily viable strategy in one-shot social dilemmas. However, in many situations agreements aim to establish long-term mutually beneficial interactions. Our analytical and numerical results reveal for the first time under which conditions revenge, apology and forgiveness can evolve and deal with mistakes within ongoing agreements...