Research Articles.- Duality and existence for a class of mass transportation problems and economic applications.- Functional evolution equations governed by m-accretive operators.- Nonlinear generalizations of theorems on inverse-positive matrices.- Implicit functions and diffeomorphisms without C1.- Optimization and Lagrange multipliers: non-C1constraints and “minimal” constraint qualification.- Monte Carlo method for pricing of Bermuda type derivatives.- Historical Perspective.- Mathematical economics in Vienna between the Wars.