Consider the time-t value of the LIBOR-in-arrears payment [see (8.3.14a,b)], show that where C j (t; T

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Consider the time-t value of the LIBOR-in-arrears payment [see (8.3.14a,b)], show that 

VL(t) = B(t, Tj) E'; [aj +Lj (T;)] = j Lj(t) + +  2ajaj+1Cj (t; Tj, Tj+1, X) DX,

where Cj (t; Tj ,Tj+1,X) is the time-t value of the caplet with strike X, resetting at Tj and paying max(Lj (Tj) − X, 0) at Tj+1.

For any twice-differentiable function V (y) defined for y ≥ 0, we have

V(y) = V(0) +yV'(0) + fo V" (X) max (y - X, 0) dx.

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