Riesz representation theorem

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What Wikipedia says

The Riesz representation theorem, sometimes called the Riesz–Fréchet representation theorem after Frigyes Riesz and Maurice René Fréchet, establishes an important connection between a Hilbert space and its continuous dual space.

Excerpt from the Wikipedia article “Riesz representation theorem”, under the CC BY-SA 4.0 license. Read the article on Wikipedia