Consider the HullWhite model where the short rate process follows where Z t is a Brownian process

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Consider the Hull–White model where the short rate process follows 

dr = [(t) art] dt + o dZt, -

where Zt is a Brownian process under the risk neutral measure Q. Using the relation

d[r(t)eat] = $(t)eat dt + oeat dz(t),show that

S.T 1- e-(T-t) r(u) du = r(t). n J_J+ 1  = r(t). JJ - e-(T-1) + oe-a(u-s) dz(s) du (u)e-a(u-s) ds du T [ (u).

Accordingly, the mean and variance of ∫tT r(u) du are found to be

1 (1)  - e-a(T-1)  T T var (f

Compute the bond price B(r, t; T).

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