<正> Black-Scholes equation is used to model stock option pricing.In this paper,optimal systems with one to fourparameters of Lie point symmetries for Black-Sch
<正> In this paper,we consider the phenomenon of stochastic resonance(SR)in a quartic bistable system underthe simultaneous action of a multiplicative non-Gauss
<正> Understanding the cause of the synchronization of population evolution is an important issue for ecologicalimprovement.Here we present a Lotka-Volterra-typ