Erster Quadrant/Definition

Quadrant

Die Teilmenge

Q=\mathbb {R} _{\geq 0}\times \mathbb {R} _{\geq 0}={\left\{(x,y)\in \mathbb {R} ^{2}\mid x\geq 0{\text{ und }}y\geq 0\right\}}

heißt

(erster) Quadrant.

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