Valuations and real places in the theory of formally real fields -- An introduction to Nash functions -- Real valuation rings and ideals -- Variantes du Nullstellensatz réel et anneaux formellement réels -- Ensembles semi-algebriques -- The real holomorphy ring and sums of 2n-th powers -- On certain topological spaces admitting strongly coherent real algebraic structure -- Remarks and counterexamples in the theory of real algebraic vector bundles and cycles -- Topology of real analytic sets — Some open problems -- The divisor class groups of some rings of global real analytic, Nash or rational regular functions -- Real spectra and distributions of signatures -- Transversal zeros and positive semidefinite forms -- Zur Theorie der semialgebraischen Wege und Intervalle über einem reell abgeschlossenen Körper -- Subordinate structure sheaves -- The extension theorem for Nash functions -- Separation des composantes connexes reelles dans le cas des varietes projectives -- On real one-dimensional cycles -- Sur l’homologie des surfaces algèbriques réelles -- Etude des coupures dans les groupes et corps ordonnes -- Faisceau structural sur le spectre réel et fonctions de Nash -- Real holomorphy rings in real algebraic geometry -- A bound on the order of H n?1 (a) (X, ZZ / 2) on a real algebraic variety -- Le probleme d’algebrisation des polyedres est local.