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<math> \prod_{j=1}^N (x_{j,1} B^{ m} + x_{j,0}) = \sum_{i=1}^{2^{N+1}-1}
\prod_{j=1}^N x_{j,c(i,j)}B^{m\sum_{j=1}^N c(i,j)} = \sum_{
</math>, where <math> c(i,j) </math> means digit in number i at position j. Notice that <math> c(i,j) \in \{0,1\} </math>
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