Suppose the forward rate F(t, ) & is defined in terms of running time t and time

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Suppose the forward rate F̂(t, τ) & is defined in terms of running time t and time to maturity τ (instead of maturity date T), where

F(t, t) = F(t, t+t).

Under the one-factor HJM framework, we write σ &(t, τ) = σF (t, t +τ). Show that the dynamics of F̂(t, τ) & under the risk neutral measure Q are given by (Brace and Musiela, 1994)

+0F(t, t) dz(t). 0 op [xp(x\da Janta + (0g=

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