Einheitskugel/R^n/Definition

Einheitskugel

Die Teilmenge

E={\left\{x=(x_{1},\ldots ,x_{n})\in \mathbb {R} ^{n}\mid x_{1}^{2}+\cdots +x_{n}^{2}\leq 1\right\}}

heißt ${}n$ -dimensionale (abgeschlossene) Einheitskugel.

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