Titre : On the computing power of semialgebraic functions Exposant : Marcello Mamino Résumé : We will compare the computing power of variants of the Blum-Shub-Smale model in which real Turing machines are endowed with the power to compute certain semialgebraic functions in one step. For a large class of such models, we present a characterization of the Boolean parts of time complexity classes up to polynomial time Turing reduction.