An Imaginary Ax-Kochen-Ershov principle

16 May 2019
11:30
Silvain Rideau

Further Information: 

 (work in progress with Martin Hils)

Abstract

In the spirit of the Ax-Kochen-Ershov principle, one could conjecture that the imaginaries in equicharacteristic zero Henselian fields can be entirely classified in terms of the Haskell-Hrushovski-Macpherson geometric imaginaries, residue field imaginaries and value group imaginaries. However, the situation is more complicated than that. My goal in this talk will be to present what we believe to be an optimal conjecture and give elements of a proof.