### Witt Motives, Transfers and Dévissage , by Baptiste Calmes and Jens Hornbostel

We define "transfer morphisms" (also called "push-forwards" or "norm
morphisms") between coherent Witt groups of schemes along proper morphisms and
establish the base change and projection formulae for those. We then use this
to define the category of "Witt motives". We also deduce a d\'evissage
theorem. Finally, we obtain some results about Witt groups of cellular
varieties.

Baptiste Calmes <calmes@math.jussieu.fr>

Jens Hornbostel <jens.hornbostel@mathematik.uni-regensburg.de>