locus

Locus (from Latin locus ‘’) is a set of points satisfying a certain condition and such that no point outside the set satisfies this condition.

For example, in the plane the locus of such point that is at a fixed distance $r$ from a fixed point $O$ is the circle with centre $O$ and radius $r$ ; the locus of such point which is equidistant from both ends of a line segment is the perpendicular bisector of this line segment.

In general, the loci in the plane are geometric curves; thus one may speak of locus curves.

单词	Locus
释义	locus Locus (from Latin locus ‘’) is a set of points satisfying a certain condition and such that no point outside the set satisfies this condition. For example, in the plane the locus of such point that is at a fixed distance $r$ from a fixed point $O$ is the circle with centre $O$ and radius $r$ ; the locus of such point which is equidistant from both ends of a line segment is the perpendicular bisector of this line segment. In general, the loci in the plane are geometric curves; thus one may speak of locus curves.
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