yuangord 发表于 2014-1-14 00:03 
One more note: not all payoffs are smoothing. However, certain smoothing technique can be employed. ...
thanks very much,
I know a basic method is to use some piecewise smooth function fn(x) to approximate f(x). As n goes to infinity, fn(x) will converge to f(x) which is a non-smooth payoff (e.g. with kinks)