| Résume | In the late 1990s, Voevodsky initiated a unification of algebraic and topological methods. Combining algebraic geometry and homotopy theory, Morel and Voevodsky developed what is now called motivic homotopy theory, the main idea of which was to apply the techniques from classical algebraic topology to the study of schemes (the affine line A1 playing the role of the unit interval [0,1]). The main achievement of this new theory was the proof of Milnor's conjecture by Voevodsky (in particular thanks to Rost's work), which earned him the Fields Medal in 2002.
In this talk, we will start with some general background in motivic homotopy theory, and then present some consequences of the study of Milnor-Witt cycle modules and their associated Chow-Witt groups in birational geometry. |
