7.5 Martingales
Exercise 7.5.1. Let T = inf { B t ∉ ( − a , a ) } T=\inf \left\{B_{t} \notin(-a, a)\right\}T
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Exercise 7.5.1. Let T = inf { B t ∉ ( − a , a ) } T=\inf \left\{B_{t} \notin(-a, a)\right\}T