a central point.

Mathematics. Geometry. A system of pairs of points on a right line, so situated that the product of the distances of the two points of each pair…

Specific uses. Mathematics (a) A set of three things, esp. in Geometry of three points. (b) In Quaternions, An indeterminate product of three vectors.

Mathematics. A set of points on a straight line, esp. as determining a pencil (pencil, n. 7) of lines joining each point to some non-collinear point.

A set of points.

In spec. uses. Mathematics. (See quot. 1889.)

a system of three points with the straight lines connecting them (Cent. Dict. Suppl. 1909).

Mathematics. The set of points of a topological space whose distance from a given point is less than, or is less than or equal to, some non-zero…

a combination of three nodes at one point of a curve.

A group of three sets of points or lines having a relation analogous to that of homography between two (see homography, n. 1); that branch of…

Used in the possessive and attributively to designate various concepts relating to the theory of sets and infinite numbers arising out of…

Mathematics. The set of lines consisting of tangents to a system of conic sections. Obsolete. rare.

a closed path in phase space representing a limit; esp. one that is an attractor.

a set of points in 24-dimensional Euclidean space regularly arranged such that each point has exactly 196,560 nearest neighbours.