Suppose the dynamics of L i (t) under the forward measure Q T k is governed by

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Suppose the dynamics of Li(t) under the forward measure QTk is governed by (8.3.23), show that the distribution of the LIBOR Li(T ) under QTk admits the following lognormal approximation (Daniluk and Gataret, 2005):

T T L;(T)  L; (0) exp(* %ik (1, T) dz^ (1) of (t) dt 2 T + ["* mu(1,7) di). S Mik(t, T) 0 where T  min(Ti, Tk), Cik (t, T) = (i) i < k T - [! (u) du and  (t, T) = ! (t) -  C;;(t,T); = j=i+1 IN ,) =

(t, T) = ;(0)6( j=k+1 i Cij (t, T) 1 + aj+1L;(0) j-1  K (0) (  l=k+1

Use integration by parts to show that

T T ["" = [" Kj(t)o(t)o(t) dt = [ K (0) 0 / (1) of (1) di 0 0 T + [ Cij (t, T) dKj(t).Subsequently, show that

dKj(t) = Kj(t)o! (t) 1 + j+Lj(t) dt+dZk (t)}. 5 {[rkj(1)  K;(1)0} (1)]dt -

Applying the “frozen” LIBOR technique, show that

dKj(t) ~ dKj(t) ~ k 1 [d2 (1) -  Ke (0) { (1) dt] for j < k l=j K; (0)of (1) 1+ j+1L; (0) j-1 ( [ l=j Kj

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