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Use for questions regarding duality of mathematical object, i.e. dual spaces, objects with two possible interpretations etc.

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Faltings' Cartier duality for A-modules in terms of Hopf algebras

.$$ In fact, this is an isomorphism of Hopf algebras, so that classical Cartier duality of finite group schemes is the same as the linear duality in the setting of finite Hopf algebras. … How is Faltings $A$-Cartier duality related to linear duality of Hopf algebras, or Cartier duality of underlying group schemes? …
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