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The map <math>\left[ \mathbf{N}\right] :\left( \mathbb{Z}_{2}\right)
^{2n}\rightarrow\left[ \Pi^{n}\right] </math> is an [[isomorphism]] for the same
reason given as in the previous case:
:<math>
\left[ \mathbf{N}\left( \mathbf{u+v}\right) \right] =\left[
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