Foreword -- On the use in economic theory of some central results of mathematical analysis -- Research Articles -- Heterogenous probabilities in complete asset markets -- Convergences in LX1(?) -- Product differentiation and market power -- A Remark on default risk models -- Evaluation of yield spread for credit risk -- Analysis of the asymptotic distance between oscillating functions and their weak limit in L2 -- Survey -- Chaotic solutions in infinite-time horizon linear programming and economic dynamics -- Note -- Determinacy of monetary equilibria in an economy with no real risk -- Programme: KES/RCME Conference on mathematical analysis in economic theory in honor of Professor Gรฉrard Debreu. October 4โ{128}{147}5, 1997, Keio University (Tokyo)