André Stephane Hamer

Stephane Genieys

Evolutionary branching, or adaptive speciation, is a feature that is hard to account for in usual mutation-selection systems. With some other features such as evolution towards extinction or evolutionary cycles, it is a privileged subject of adaptive dynamics. Adaptive dynamics makes a link between ecological and evolutionary theory. To the usual influence of the environment on the population t...

D:/stephane/vision/papiers/VIIP 2003/color_njet.dvi

KEY WORDS color models, gray model, local jets, points of interest, indexing , matching.

A conjecture of Yves André . ∗

The introduction to [2] (and references contained therein) contains a comprehensive exposition of terminology and notations relative to this conjecture. Since we use the same terminology and notations, we do not reproduce them here. The introduction to [2] also contains an exposition of results on this conjecture obtained before the article [3] came out. In this article we prove the following t...

François Bach and André Herbelin

Reals which Compute Little André

We investigate combinatorial lowness properties of sets of natural numbers (reals). The real A is super-low if A′ ≤tt ∅′, and A is jump-traceable if the values of {e}A(e) can be effectively approximated in a sense to be specified. We investigate those properties, in particular showing that super-lowness and jump-traceability coincide within the r.e. sets but none of the properties implies the o...