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Geometric objects lying in a common plane are said to be coplanar. Three noncollinear points determine a plane and so are trivially coplanar. Four points are coplanar iff the ...

The locus of a point which is derived from a fixed point Q by continuous parallel displacement.

An umbilic point, also called simply an umbilic, is a point on a surface at which the curvature is the same in any direction.

A set in R^n which can be reduced to one of its points, say P, by a continuous deformation, is said to be contractible. The transformation is such that each point of the set ...

A sequence of n-tuples that fills n-space more uniformly than uncorrelated random points, sometimes also called a low-discrepancy sequence. Although the ordinary uniform ...

The thin plate spline is the two-dimensional analog of the cubic spline in one dimension. It is the fundamental solution to the biharmonic equation, and has the form ...

The evolute of a circle is a degenerate point at the origin.

A singular point a for which f(z)(z-a)^n is not differentiable for any integer n>0.

The point with respect to which a radial curve is computed.

The space join of a topological space X and a point P, C(X)=X*P.