，成果详细信息-全讯担保网

in ergodic stochastic problems the limit of the value function vλ of the associated discounted cost functional with infinite time horizon is studied, when the discounted factor λ tends to zero. these problems have been well studied in the literature and the used assumptions guarantee that the value function λvλ converges uniformly to a constant as λ→0. the objective of this work consists in studying these problems under the assumption, namely, the nonexpansivity assumption, under which the limit function is not necessarily constant. our discussion goes beyond the case of the stochastic control problem with infinite time horizon and discusses also vλ given by a hamilton–jacobi–bellman equation of second order which is not necessarily associated with a stochastic control problem. on the other hand, the stochastic control case generalizes considerably earlier works by considering cost functionals defined through a backward stochastic differential equation with infinite time horizon and we give an explicit representation formula for the limit of λvλ, as λ→0.