Let W n (S; X) = lim e r Un(S, ; X), where U
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Let Wn∞ (S; X) = limτ→∞ erτUn(S, τ ; X), where Un(S, τ; X) is the value of the n-reset put option [see (5.4.20)]. For r n∞ (S) is given by (Dai, Kwok and Wu, 2003)
The auxiliary conditions are given by
where βn = W∞n−1(1; 1). Show that
where α = 2(q − r)/σ2. The recurrence relation for βn is deduced to be
Show that β1 = 1 and limn→∞ βn = 1 + 1/α . Also, find the first few values of S∗n,∞.
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