Following the n-factor HJM framework, let the forward rate F(t, T) be governed by the following dynamics

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Following the n-factor HJM framework, let the forward rate F(t, T) be governed by the following dynamics 

S F(t, T) = F(0, T) + a(u, T) du + +  i=l ;(u, T) dZ(u).

Show that the covariance of the increments of F(t,T1) and F(t,T2) is given by

n (t, );(t, 2). i=1Deduce that under the one-factor model, which corresponds to n = 1, the changes in F(t,T1) and F(t,T2) are fully correlated. 

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