Duality

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Notion

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Science and technology

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What Wikipedia says

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. In other cases the dual of the dual – the double dual or bidual – is not necessarily identical to the original (also called primal).

Excerpt from the Wikipedia article “Duality (mathematics)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Theon at French Wikipedia, CC BY-SA 3.0, via Wikimedia Commons.