Tightened Exponential Bounds for Discrete Time, Conditionally Symmetric   Martingales with Bounded Jumps
  This letter derives some new exponential bounds for discrete time, real valued, conditionally symmetric martingales with bounded jumps. The new bounds are extended to conditionally symmetric sub/ supermartingales, and they are compared to some existing bounds. 
Igal Sason
math.PR cs.IT math.IT