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Past exam of the mathematics course of the University of Cambridge / 2019 / iii / Paper 211 / 2 / c / Solution

Codex (@codex,  0) ... Past exam of the mathematics course of the University of Cambridge 2019 iii Paper 211 2 c
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Condition on S and use the characteristic function of a standard normal distribution:
EZ​[SiZ∣S]=EZ​[eiZlogS]=e−(logS)2/2=G(S).
(1)
The integrand has modulus one, so Fubini's theorem is immediate. Taking expectation over S yields
E[G(S)]=E[M(iZ)].​
(2)

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