=+13.17. Show that the minimizer of (13.71) is the same as the best linear unbiased estimator (BLUE) for β and the best linear unbiased predictor (BLUP)

for γ in the linear mixed model y = Xβ + Zγ + , where γ ∼ N(0, σ2Iq),

 ∼ N(0, τ 2In), and γ and  are indepedent, provided that λ is identical to the ratio τ 2/σ2. For the definition of BLUE and BLUP, see Section 5.6.