A^1-algebraic topology over a field Fabien Morel AMS Classification numbers: 14F05, 19E15, 55P Fabien Morel Mathematisches Institut der Universität München Theresienstr. 39 D-80333 München Fabien Morel Text of Abstract: ------------------------------------------------------------------ In this work we prove some basic results in the context of A1-homotopy theory of smooth schemes over a field k : the analogue of the Brouwer degree, the Hurewicz theorem, the theory of A1-coverings and its relationship to the fundamental A1-homotopy sheaf, and some fundamental computations involving unramified Milnor-Witt K-theory like the fundamental A1-homotopy sheaves of P^n and SL_n . ------------------------------------------------------------------