Hahn–Banach theorem

Rarity: Uncommon

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

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

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Notion

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Science and technology

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What Wikipedia says

In functional analysis, the Hahn–Banach theorem is a central result that allows the extension of bounded linear functionals defined on a vector subspace of some normed vector space to the whole space.

Excerpt from the Wikipedia article “Hahn–Banach theorem”, under the CC BY-SA 4.0 license. Read the article on Wikipedia