Duality (mathematics) - Wikipedia
https://en.wikipedia.org/wiki/Duality_(mathematics)
WebDuality (mathematics) In mathematics, a duality translates concepts, theorems or mathematical structures into other concepts, theorems or structures, in a one-to-one fashion, often (but not always) by means of an involution operation: if the dual of A is B, then the dual of B is A. Such involutions sometimes have fixed points, so that the dual ...
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