Yvon-André Lacroix

Thomas Lacroix

The views expressed herein are those of the authors and do not necessarily represent the view of Coffey International Development, the consortium members of GSDRC or DFID. This consultancy assesses current migration research to determine the key factors which need to be considered in order to better understand the drivers of migration for poor people, as well as the social and economic costs an...

Thomas Lacroix and Stephen Castles

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...