Algebraic Topology Rational Homotopy : Proceedings of a Conference held in Louvain la Neuve Belgium May 2–6 1986 This proceedings volume centers on new developments in rational homotopy and on their influence on algebra and algebraic topology. Most of the papers are original research papers dealing with rational homotopy and tame homotopy cyclic homology Moore conjectures on the exponents of the homotopy groups of a finite CW c complex and homology of loop spaces. Of particular interest for specialists are papers on construction of the minimal model in tame theory and computation of the Lusternik Schnirelmann category by means articles on Moore conjectures on tame homotopy and on the properties of Poincaré series of loop spaces