Quadratic reciprocity

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

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Notion

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Science and technology

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What Wikipedia says

In number theory, the law of quadratic reciprocity is a theorem about modular arithmetic that gives conditions for the solvability of quadratic equations modulo prime numbers. Due to its subtlety, it has many formulations, but the most standard statement is:

Excerpt from the Wikipedia article “Quadratic reciprocity”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Gottlieb Biermann / After Christian Albrecht Jensen, Public domain, via Wikimedia Commons.