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We give an introduction to the Mathematica packages "MasterPVA" and"MasterPVAmulti used to compute lambda-brackets in Poisson vertex algebras,which play an important role in the theory of infinite-dimensional Hamiltoniansystems. As an application, we give an introduction to the Mathematica package"WAlg" aimed to compute the lambda-brackets among the generators of classicalaffine W-algebras. The use of these packages is shown by providing someexplicit examples.

MasterPVA and WAlg: Mathematica packages for Poisson vertex algebras and classical affine $\mathcal{W}$-algebras