McCauley, J.L.; Gunaratne, G.H.; Bassler, K.E. - In: Physica A: Statistical Mechanics and its Applications 380 (2007) C, pp. 351-356
We show that our earlier generalization of the Black–Scholes partial differential equation (pde) for variable diffusion coefficients is equivalent to a Martingale in the risk neutral discounted stock price. Previously, the equivalence of Black–Scholes to a Martingale was proven for the case...