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What is Alexander-Whitney duality?
At the risk of derailing the thread... how? Dualities are typically expressible as contravariant functors -- the closest "natural transformation" gets to the notion of duality is there is typically a natural transformation (usually isomorphism) from an object to the dual of its dual.Since it's a http://en.wikipedia.org/wiki/Natural_transformation" [Broken], it could be labeled a duality.