Show that not only xx , but also xx vanishes in the limit

Show that not only σ_xx , but also ρ_xx vanishes in the limit τ → ∞, where ρxx is the diagonal resistivity defined by

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õ = Pxx Pxy 0 - Pxy Pxx 0 0 :) = 0 | =õ–¹ po (5.10.10)