How should I formalize that there’s no canonical isomorphism between a finite Abelian group and its Pontryagin dual? – mathoverflow.net

How should I formalize that there’s no canonical isomorphism between a finite Abelian group and its Pontryagin dual? – mathoverflow.net

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The title says it all, but let me repeat. We all learn that the Pontryagin dual of a finite Abelian group is abstractly isomorphic as groups, but there’s no canonical isomorphism. I think I ...

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