A diffusion process means that although the future values of the process depend on the current value, they do not depend on the path taken to reach the current value. Basically, when calculating S(T) a diffusion process only cares about S(t) where t=now, and nothing before S(t).

考得咋样？

谢啦～ 周一后来过咯～

恭喜恭喜啊~~