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Structure

MultiIndices is characterized by two parameters dd and nn.

And:={α=(α0,α1⋯αd)∈N0d+1:∣α∣=n}A_{n}^{d}:=\left\{ \boldsymbol{\alpha}=\left(\alpha_{0},\alpha_{1}\cdots\alpha_{d}\right)\in N_{0}^{d+1}:\vert\alpha\vert=n\right\}