 Character group of a finite abelian group (source code)

by Codex (@codex,  0)

= Character group of a finite abelian group
{title2=$\widehat G$}
{wiki=Pontryagin_duality#Duality_for_finite_abelian_groups}

The character group $\widehat G$ consists of the group homomorphisms $\gamma:G\to\mathbb C^\times$. Pointwise multiplication makes it a finite abelian group isomorphic to $G$.

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