Goldbach's conjecture

Rarity: Rare

A topic known well beyond its field, found in many languages.

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Notion

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Science and technology

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What Wikipedia says

Goldbach's conjecture is one of the oldest and best-known unsolved problems in number theory and all of mathematics. It states that every even natural number greater than 2 is the sum of two prime numbers.

Excerpt from the Wikipedia article “Goldbach's conjecture”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Adam Cunningham and John Ringland, CC BY-SA 3.0, via Wikimedia Commons.