Gérard Althabe (1932-2004)

Gérard Maze and Lorenz

Cryptography based on Semigroup Actions ∗ Gérard Maze

A generalization of the original Diffie-Hellman key exchange in (Z/pZ) found a new depth when Miller [27] and Koblitz [16] suggested that such a protocol could be used with the group over an elliptic curve. In this paper, we propose a further vast generalization where abelian semigroups act on finite sets. We define a Diffie-Hellman key exchange in this setting and we illustrate how to build in...

6 Dynamics of trap models Gérard

3 The one-dimensional trap model 9 3.1 The Fontes-Isopi-Newman singular diffusion . . . . . . . . . . . . . . . . 10 3.2 The scaling limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.3 Aging results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 3.4 Subaging results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.5 Behaviour of t...

Robin Holliday 1932–2014

Robin Holliday When the founder of a field of investigation departs from our midst, there is the palpable feeling among his or her close associates that an era has come to an end. Such is the sense that the elders of the field of genetic recombination feel with the passing of Robin Holliday, whose very name is synonymous with the process. Hediedathis homeon theoutskirtsofSydney, Australia, on t...

Op-brhe130268 1931..1932

We have known about the strong association between AS and the HLA-B*27 (B*27) gene for the past 40 years; however, the mechanism with which only some allomorphs of the HLA-B27 molecule, as well as some other HLA class I molecules, are involved in the occurrence of SpAs is still unclear [1]. In this issue of Rheumatology, Cauli et al. [2] present data that may aid our understanding of this mecha...