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In page Group isomorphism:

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* The Klein four-group is isomorphic to the direct product of two copies of Z 2 = Z / 2 Z {\displaystyle \mathbb {Z} _{2}=\mathbb {Z} /2\mathbb {Z} } (see modular arithmetic), and can therefore be written Z 2 × Z 2 {\displaystyle \mathbb {Z} _{2}\times \mathbb {Z} _{2}} . Another notation is Dih2, because it is a dihedral group.