Question: Use induction to establish that drifts, 1, . . . ,n, must satisfy (17.103) under the no-arbitrage assumption. Show that Dn+1(t) is a martingale if

Use induction to establish that drifts, μ1, . . . ,μn, must satisfy (17.103) under the no-arbitrage assumption. Show that Dn+1(t) is a martingale if and only if Ln(t)Dn+1(t) is a martingale and then apply Itô's lemma to obtain (17.103).

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