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A curve which intersects some straight line in an infinity of points (but for which not every point lies on this curve).

A transformation of period 2.

A transformation of the form A^'=UAU^(H), where U^(H) denotes the conjugate transpose.

A homogeneous ideal defining a projective algebraic variety is unmixed if it has no embedded prime divisors.

A surface represented parametrically by elliptic functions.

The plane through an edge of a trihedron drawn perpendicularly to the opposite face. The term was first used by J. Neuberg (Altshiller-Court 1979, p. 298).

An archaic name for the torus.

A convex planar domain in which the minimal generalized diameter is >1 always contains a circle of radius 1/3.

A transformation of the plane which transforms collinear points into collinear points. A projective collineation transforms every one-dimensional form projectively, and a ...

A plane parallel to two (or more) skew lines, also called a director plane. The orientation of a director is fixed, but it is specified uniquely only if a point lying on it ...