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The Cartesian coordinates of a point in $\mathbb{R}^3$ for determining its place in three-dimensional space are the three real numbers $x$ $y$ and $z$ which are called
- $x$ coordinate or abscissa,
- $y$ coordinate or ordinate,
- $z$ coordinate or applicate.
The last name ``applicate'' is rare in English, but its equivalents in continental European languages, as ``die Applikate'' in German and ``aplikaat'' in Estonian, are more known.
Similarly, in $\mathbb{R}^n$ for all $n = 1,\,2,\,3,\,\ldots$ , one needs $n$ coordinates for specifying the location of a point.
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