This article discusses the existence problem of a compact quotient of a symmetric space by a properly discontinuous group with emphasis on the non-Riemannian case. Discontinuous groups are not always abundant in a homogeneous space G/H if H is non-compact. The first half of the article elucidates general machinery to study discontinuous groups for G/H , followed by the most update and complete ...

This note shows that introducing into the economy a few number of agents who do not support sunspots theories magnifies endogenous business cycles fluctuations when the current state of the economic system is sensitive enough to traders' forecasts, or equivalently, in presence of indeterminacy. Citation: Gauthier, Stéphane, (2004) "Small departures from rationality magnify fluctuations." Econom...

Hall-Mairesse-Turner June 2005 2 Identifying Age, Cohort and Period Effects in Scientific Research Productivity: Discussion and Illustration Using Simulated and Actual Data on French Physicists 1 Bronwyn H. HALL, Jacques MAIRESSE, and Laure TURNER