Question: Prove the commutation relation (4.2.17) using the definitions of a k and a k and the commutation relation [x n , p n

Prove the commutation relation (4.2.17) using the definitions of a_k and a^†_k and the commutation relation [x_n, p_n_′ ] = ih̄δ_n,n_′. The identity (4.2.9) is useful. [ak, ay] = dk k', (4.2.17)

[ak, ay] = dk k', (4.2.17)

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