. Let AW= W{i + At) - W(t) be an increment in a standard Wiener process.

Examine the limits as A/ ^ 0 of (i) E[A fL], (ii) Var[AfL], (iii) E[AfL/A/], and (iv) Var[AH//A/] to provide an indication that W has continuous but not differentiable sample paths.