Suppose the price process of an asset follows the diffusion process Show that the corresponding governing equation

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Suppose the price process of an asset follows the diffusion process 

dSt = (St, t) dt + o (St, t) d Z.Show that the corresponding governing equation for the price of a derivative security V contingent on the above asset takes the form

av 1 t +50 (S, 1). av as av +rS -rV = 0, as

where r is the riskless interest rate. Again, the derivative price V does not depend on the instantaneous mean μ(St,t) of the diffusion process.

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