Question: Consider the portfolio C(s, t) St. Assume that the dynamics of S (t) are: dSt = St + dWt (13.70) Apply Ito's Lemmato C(s,

Consider the portfolio C(s, t) − ∆St. Assume that the dynamics of S (t) are:
dSt = μSt + σdWt (13.70)
Apply Ito's Lemmato C(s, t) − ∆St to obtain the PDE of this portfolio as a function of Ds and dt. Let ∆ be equal to the delta of the option, that is: ∆ = ∂C/∂S. Comment on the relationship between the derivative with respect to time, theta, and the second derivative with respect to the underlying, gamma, from the perspective of an investor.

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