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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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Which categories are the categories of models of a Lawvere theory?

Adámek and Rosický [On sifted colimits and generalized varieties] have shown that a category $\mathcal{C}$ is equivalent to the category of models for a (finitary) Lawvere theory in $\mathbf{Set}$ if …
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