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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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Do any Stone-like dualities have some self-dualities hidden inside them?

What about Gelfand duality in this context? … Here Priestley duality, once restated as spectral duality (the original form by Stone), reduces to the Birkhoff transform: the equivalence between finite posets, finite T$_0$ (topological, even T$_D$ and …
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