Let C do (S, ; X,H,r,q) and P uo (S, ; X,H,r,q) denote the price
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Let Cdo(S, τ ; X,H,r,q) and Puo(S, τ ; X,H,r,q) denote the price function of an American down-and-out barrier call and an American up-and-out barrier put, respectively, both with constant barrier level H. Show that the put-call symmetry relation for the prices of the American barrier call and put options is given by (Gao, Huang and Subrahmanyam, 2000)
Let S∗do,call (τ ; X,H,r,q) and S∗uo,put(τ ; X,H,r,q) denote the optimal exercise price of the American down-and-out call and American up-and-out put, respectively. Show that
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